Hinge force physics. Gate. No way to find each force individually. However, often in solving problems we assume that the force in this type of rod is parallel to the rod itself, such as here: May 18, 2012 · 2. Jun 21, 2007 · 727. Nov 21, 2006 · Calculating Forces in a Stepladder with a Hinge. To solve this problem, we can use the formula for torque: T = rFsinθ, where T is the torque, r is the distance from the pivot point, F is the force, and θ is the angle between the force and the lever arm. Nov 5, 2014 · To calculate the torque on a door with hinges, you will need to know the force applied to the door and the distance from the hinges to the point where the force is applied. The attempt at a solution: Since the rod is just released, the only force that it will exert at the hinge Dec 15, 2018 · The horizontal force component at the hinge of a flag pole can be calculated using the formula F = mg tanθ, where F is the horizontal force component, m is the mass of the flag pole, g is the gravitational acceleration, and θ is the angle of the pole from the vertical. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. The gate has hinges attached to the top and bottom, and a guide wire with a tension of 221 N at an angle of 39 degrees. As the applied force moves away from the hinge, the process I described in the above paragraph kicks in. The hinges will obviously carry the weight of the gate. So, in general: angular momentum conservation is usable when there are no external torques. The resultant force on it is zero. Find the direction and magnitude of the horizontal force applied to the door by the top hinge? I Apr 11, 2010 · The purpose of calculating forces on a hinge for a dynamically loaded stick is to determine the amount and direction of forces acting on the hinge, which is important for understanding the overall stability and structural integrity of the stick. Suppose the force acts at the bottom end of the rod. Learn more at http://www. The attempt at a solution involves using the "Z-rule" for angles and taking into account the weight of the beam acting at an angle. In the case of a massless beam, the hinge supports the beam by allowing it to rotate freely around the hinge point without any resistance. The horizontal force on the door is caused by the torque from the hinges, as demonstrated by imagining what would happen if only one hinge were attached. The blocks are placed at two-fifths and three-fifths of the way up the beam, creating angles of 12° and 20° respectively. While the arm is moving: #3: Heat is lost due to friction. Taking moments about the hinge is a good way to avoid including the force from the hinge. This can be represented mathematically as T = F x r, where T is torque, F is the normal force, and r is the moment arm. Apr 18, 2021 · The forces exerted by a wall on a hinged rod can be affected by several factors, including the material properties of the rod, the angle of the load applied, the location of the hinge, and the type of support at the fixed end. The rod’s mass of 2. May 17, 2021 · Why does rotation happens about hinge point in a bar when net force acting on it are zero? The short answer is because there is a net torque about the hinge pin caused by two equal, opposite, and parallel forces which constitute a force-couple, or simply a "couple", resulting in no net force on the bar. Physically, it is the distance from the axis of rotation to the point where the force is applied. 5m from the top and the other 0. All the force I am applying to the door is parallel. State whether this change will increase, decrease or have no effect on the horizontal. Sep 12, 2022 · Find the forces on the hinges when the door rests half-open. If you are asked to find the magnitude and direction of the force from the hinge: Step 1: Find the horizontal and vertical components of the force. On a body, a force of 5N is applied towards North and another force of 2N is applied towards South. 00m wide and 2. 1. If the rod is released from a horizontal position, what force will it exert on the hinge just after being released? a)W b)W/2 c)W/3 d)W/4 choose the correct option[/B]2. 25 November 21. Ball Hinge Net Net torque Rod System Torque Zero. The hinges are separated by distance [latex]a=2. Apr 29, 2023 · With both GameObjects selected, we can create a hinge joint by navigating to the Component menu and selecting Physics > Hinge Joint. Make sure to use the appropriate units for force (newtons) and distance (meters) in your calculation. Apply the equations of static equilibrium, which state that the sum of all forces in the horizontal direction and the sum of all forces in the vertical direction must equal zero. Conditions for static equilibrium are given in section 10-9. Sep 11, 2023 · Work done by a force is $0$ if $\vec F \cdot \vec d = 0$. To solve this I set up equilibrium equations. Feb 15, 2021 · For an ordinary swinging door, the kind that is hinged at one side: Force causes the center of mass of the door to move, torque causes the door to rotate on its hinges. How do you calculate the contact force in a hinge? The contact force in a hinge can be calculated using the equation F = kθ, where F is the contact force, k is the hinge's stiffness, and θ is the angle of rotation. To calculate torque we must introduce a new vector, r. From here we grab the “next” chain’s Rigidbody as our hinge joint’s focus to essentially say “you are connected to this object”, then we Apr 29, 2010 · The door is hanging on two hinges, one at the top and one at the bottom. The door has a mass of 10. 5kg, a width of 1. 16 A 400-N swinging vertical door is supported by two hinges attached at points A and B. ) 2. The tension in the cable and the force acting on the hinge at the bottom can be found by using the equations of static equilibrium. EXPLORATION 10. This force is broken down into two smaller forces we are calling the vertical force, “V” and a horizontal force “H. In that case, the total force is $0$. Nov 18, 2020 · New videos every week! Subscribe to Zak's Lab https://www. The hinges are placed at 20 and 120 cm from the bottom of the gate. ⇒F1 and F2 exert no torque (Parallel to axis or rotation). Dec 24, 2015 · It allows for movement and rotation around the hinge point. (a) What fraction of the weight is supported by the opposite shore if the point of support is directly beneath the cable attachments? (b) What is the direction and magnitude of the force the hinges exert on the bridge under these circumstances? Figure 9. So the forces are parallel. These are , , and . 5m from the bottom. Torque is the cross product of two vectors, which means that torque is also a vector. Since the Nov 20, 2010 · In summary, the problem involves a metal pole with a mass of 10kg and a load with a mass of 50kg. So in this example the distance is d = 4 inches = 1/3 feet, we can graph it: For a 6' board, the force would be 6 times the weight. 5 meters tall. An 87kg man is 6m up one side and there is a 2 We would like to show you a description here but the site won’t allow us. If you take moments about the center of mass then of course the lever arm is zero and so the moments are zero but the inertial forces are still there. It is perfect for doors, but can also be used to model chains, pendulums, etc. A hinge is the most important part of the structure of a door. See in Glossary, constraining them to move like they are connected by a hinge. A door 1. force = (w*(x/2)) / d. The rope is attached at a point that is ¼ of the pole's length from the free end. Since ∑Torque = 0 Nm; Torque by R1 = Torque by R2 (opposite sign), so they must exert the same force (opposite sign) on the door. Jan 10, 2010 · Homework Statement A door made of a uniform piece of wood measures 1 m by 2 m and has a mass of 18 kg. You need to use the fact that the door is in equilibrium to write equations that will allow you to find the forces in question. A uniform rod of mass m and length l hinged at point H can rotate in a vertical plane about a smooth horizontal axis. If you flick open a pair of scissors, several things happen. It is a mechanical bearing that attaches the door to its frame and works as a pivot point while opening and closing the door. 00\,\text{m}. Jul 13, 2014 · Force Hinge Tension. Fritz. 2m (half of the door's width). 30 m wide has a mass of 13. In summary, the task is to find the cord tension and force on the hinge of a 10kg, 8. Find the acceleration of its center of mass and the horizontal force the hinge exerts. Why is it important to distribute hinge force laterally? Find the x and y components of the forces on the rod at the hinge point A and the peg C. 1m, and the two hinges are 0. Aug 21, 2022 · Angular momentum conservation then is still usable, because no external torques are acting, even though some external forces are present. What is the magnitude of the horizontal force Hx on the pivot? Mar 27, 2023 · 4. If the pivot point while measuring torques is considered to be the top hinge, does the vertical component of the force that the bottom hinge exerts on the door produce and torque? Homework Equations Torque=force*lever arm The Attempt at a Solution Mar 18, 2009 · Solve Farm Gate Problem: Horiz Force on Bottom Hinge. What is the direction of hinge force? The direction of hinge force depends on the orientation of the hinge and the direction of movement. A (x) + C (x) = 0 (force of hinge in x direction, force of peg in x direction) A (y) + C (y) -Mg - 1000 = 0. theory questions, i think it uses vectors. Mar 12, 2015 · The root cause of this is classical physics, as is the likely solution. com/Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, Mar 5, 2024 · If it's horizontal and free falls, we can apply energy conservation to find it's angular velocity at bottom as work done by hinge is 0. Usually there's some kind of mechanism where the hinge pushes directly on the door, such as cylinders slotted into each other (you may see something like this in a door nearby). The bar is held by a cord that makes a 90 degree angle with respect to the bar and 45 degree with respect to the wall. If you push on the end of the rod that is attached to the hinge in any direction, the rod doesn't move away. ⇒ F1+F2 = Fg = 294 N. The hinges (especially if not well oiled) provide a frictional counter force in the opposite direction. Jan 26, 2021 · A model door hangs from two hinges. How does a hinge support a massless beam? A hinge is a type of joint that allows for rotation between two objects. Can I calculate cord tension and hinge force mathematically? Yes, you can calculate cord tension and hinge force using the formula F = ma, where F is the force, m is the mass, and a is the acceleration. Of course your system is a rigid body and not a particle, but the idea is the same. horizontal. It is calculated by multiplying the force applied by the distance from the pivot point to the point where the force is applied. Beam and cable problem: compute the tension and hinge force using force and torque analysis. The hinges (A and B) are symmetrical, placed at the corners of the door and each supports half the weight of the door. There is a torque, and that’s what causes it to revolve. All forces and torques are therefore balanced. When the arm stops: #4: Heat is lost due to the collision. If you're seeing this message, it means we're having trouble loading external resources on our website. The horizontal force, “H,” keeps the beam from punching through the wall into the building. 800 m × 40 N × sin 90º) relative to the hinges. Apr 12, 2020 · This video screencast was created with Doceri on an iPad. $\vec d = 0$ Forces can exist even when the object they act on is stationary. The block is now moved closer to end A of the beam. Q. The value of k can be determined experimentally or through mathematical modeling. Find the force exerted by the hinge just after the rod is released from rest, from an initial position making an angle of 37∘ with horizontal. 30 m high and 1. The force needed to overcome the friction between two surfaces is measured and this is known as the friction force. #2 the free arm of the scissors is given an angular momentum. Mar 4, 2019 · It is explained that a hinge is a type of support that exerts no moment on the rod, but prevents the end of the rod from moving. With an axis through the peg and counting counterclockwise as positive: Feb 21, 2023 · However, the distance to the hinges is getting smaller and smaller, where the rotation is occurring. 630kg and length 1. Nov 29, 2006 · Each hinge supports half of the door's weight, resulting in a balance of forces. Since the hinge force does not do work, it satisfies the definition of a conservative force. my attempt: no effect. The one-word answer is torque. So far so good. Step 2: Find the magnitude by using Pythagoras. Here Are the labels I will use: W = mg = weight of door. com/channel/UCg31-N4KmgDBaa7YqN7UxUg/Questions or requests? Post your comments below, and In this particular video with Ved Prakash Sir will be explaining you a question based on hinge force which is usually seen in the topic rotation also he'll b Oct 9, 2022 · What forces act on a door? As you push on the door, you provide a driving force to make the door move. Again, because the hinge can't move, it provides an opposing force. Sep 10, 2023 · How to calculate Hinge force or Hinge reaction force | Rotational Dynamics | Important problem on rotation | IIT JEE | NEET Physics rotational motion physic Sep 19, 2018 · For PDF Notes and best Assignments visit @ http://physicswallahalakhpandey. This helps to evenly distribute the force and prevent any one area from bearing too much weight. That is where the vertical forces on the hinges come from. A free body diagram would help to better understand the forces at play. The rod is attached to a wall by a hinge at one end. In summary, the rod has no torque about its hinge point, but when the ball hits it, it imparts a non-zero torque. A thin rod of mass 0. Aug 12, 2022 · Our goal is to compute the tension in the cable and find the force exerted by the hinge. In summary, the rod experiences a pseudo force = ma when it becomes horizontal. Find the value of v such that the force exerted by the hinge on the rod just after the impact Mar 5, 2013 · Mar 5, 2013. 5. The Hinge Joint groups together two Rigidbodies A component that allows a GameObject to be affected by simulated gravity and other forces. The way we connect each chain is by attaching a RigidBody to make it a physics object, then a Hinge Joint. May 26, 2011 · The horizontal component of this force is 103 N and the vertical component is 0 N. #1 the scissors are given linear momentum. This equals to the weight of the person, which is 87kg. Apr 28, 2016 · In summary, a plank of wood is attached to a wall with a hinge, inclined at a 30 degree angle to the horizontal and held in place by a rope attached to the opposite end. To understand in which direction the forces on the door we must appreciate the following: (a) the three forces on the door are (i) its weight (mg) (ii) the force due to hinge A Oct 28, 2014 · 3. That means that all forces must balance. 10 – A hinged rod. Using the definition of torque, the net torque from either hinge must be zero. ) For example, if you push perpendicular to the door with a force of 40 N at a distance of 0. The forces that the door exerts on its hinges can be found by simply reversing the directions of the forces that the hinges exert on the door. Which I will attempt to explain here, using this diagram: Diagrams representing the two- and three-hinge configurations for We need to find the tension force in the cable and the force of the hinge on the beam. But of course the top hinge will have some force pulling it out towards the gate, and the bottom hinge will have a force pushing it against the gate post. 40 m from the top and bottom. However, the general equation for calculating torque is T = F x d, where T is the torque, F is the horizontal force, and d is the distance from the force to the point of rotation. xRandomx210. 14 lessons • 2h 43m. Feb 23, 2017 at 19:59. When the pin in the top hinge is removed, a torque is exerted about the lower hinge, which is the pivot point. This will add a new Hinge Joint component to the second GameObject. An ornate brass door hinge A barrel hinge. – John Alexiou. Oct 7, 2014 · What is distributing hinge force laterally? Distributing hinge force laterally refers to the process of spreading out or dispersing the force applied to a hinge in a horizontal direction. The task is to find the tension of the cable and the Jan 7, 2007 · The force on a hinge can be calculated using the formula F = T x L, where F is the force, T is the torque applied, and L is the length of the lever arm. Net force on the body is. Draw a free body diagram of the hanging sign, including all the known and unknown forces. Mar 9, 2008 · The equations used to solve for beam hinge torque depend on the type of beam and the complexity of the supporting structure. √10/5 mgC. It's better than I would have done free-hand. Mar 26, 2024 · Homework Statement. These forces are typically in the form of tension, compression, or shear and can be found in various structures and systems, such as human joints, bridges, and machines. How does the mass of a flexible hinge affect the friction force? The mass of a flexible hinge does not have a direct effect on the friction force. 0 kg. F xl = horizontal reaction force exerted by lower hinge on door. The hinge holds that end in place. utkarshakash. @Anubhad Das - A force is called conservative if its work does not depend on the path. Strategy. Jul 2, 2018. Find the magnitudes of these three forces. A moment is the turning effect of a force. Identify the Dec 11, 2023 · It can move (accelerate) away. Dec 1, 2020 · It weighs 40 kg, is 4 meters long and 1. Mar 6, 2013 · A door is attached to a frame by two hinges and is at equilibrium. First, let's find the torque caused by the hanging Nov 22, 2004 · The steps for solving the hanging sign problem are as follows: 1. Precisely. In general you pick a direction which simplifies the problem and an arbitrary sense (what is negative or positive). doceri. How is torque related to force acting on a hinge? The force acting on a hinge creates a torque on the object that the hinge is attached to. More info. ” The vertical force, “V,” keep the beam from sliding down the wall. A door 2. The resultant moment of forces about any point is also zero. (Consequently, the components of force in each dimension add to zero. Aug 22, 2008 · 1. 24m is at rest, hanging vertically from a strong fixed hinge at its top end. How do the forces exerted by a wall on a hinged rod impact the stability of a structure? Jul 2, 2018 · Jul 2, 2018. The hinge is fixed to a wall. It is important to draw a proper free body diagram and use proper notation when solving this type of problem. F xu = horizontal reaction force exerted by upper hinge on door. The door is entirely supported by two hinges, one at the bottom corner and one at the top corner. Similarly, there are countless other examples, where we conserve energy and assume work done by hinge force to be 0 as there is no displacement of the hinged point, so d= 0→ W= F×d= 0 d = 0 → W = F × d = 0. As a result the work of a conservative force on a closed path is zero. The angular momentum of the system (rod + ball) is conserved. The force on the top hinge of an open door can be calculated using the following formula: Force (F) = Weight (W) x Distance from Hinge (d) In this case, the weight of the door is 57. 5. Jan 12, 2016 · 1. 40 m from the bottom each support half the door’s weight (Fig. 13 1 5. Step 2: Configuring the Hinge Joint Once the hinge joint is created, we can start to configure its properties. Mar 20, 2023 · Here, we want to solve this torque AP Physics 1 question by the method of resolving the applied force and applying the formula \tau=rF_ {\bot} τ = rF ⊥, where F_ {\bot}=F\sin\theta F ⊥ = F sinθ and \theta θ is the angle the force makes with the radial line. See full list on physics-network. 2. 0 kg is uniformly distributed along its length L. Apr 30, 2014. 00 m x 2. The final answer for the cord tension is 49N. 118/5 May 16, 2014 · Freely-jointed and freely-hinged forces refer to the forces acting on a body or object that is connected by joints or hinges that allow for free movement. June 19, 2007 07:59 PM. First of all, resolve the forces along F_ {\parallel} F ∥ and perpendicular F May 25, 2012 · 1,255. The brace applies a force to the right end of the beam that is directed upward at the angle q with respect to the horizontal. √10 mg B. In my experiment, I can push in one place, and then another place closer to the hinges. Jan 11, 2020 · Three additional forces keep the beam in equilibrium. Suddenly a horizontal impulsive force (14. This counter force is added to by the drag as you push the door through the air. youtube. Apr 30, 2014 · A 50 kg box is suspended from the middle of the beam. It can push back. What factors affect the forces on a hinge for a dynamically loaded stick? Nov 19, 2017 · The torque on a rod due to the normal force at a hinge can be calculated by multiplying the magnitude of the normal force by the length of the moment arm. Figure 12. Step 3: Find the direction by using right-angled May 22, 2018 · With a hinge, the normal force between it and the rod can point in any direction, even towards the wall. 0m long beam, given a picture of the equation. Each hinge supports half the weight of the door, resulting in a vertical force of 136 N at each hinge. Sep 21, 2023 · [ JEE MAINS & JEE ADVANCED ] ANALYSIS OF HINGE REACTION [ SCHOOL PHYSICS ]🌟 Explore the Fascinating World of rotational Motion with the INSPI Web Portal! Oct 29, 2011 · A uniform bar of length 16 m and mass 8 kg is attached to a wall with a hinge that exerts a horizontal force Hx and a vertical force Hy on the bar. However, this method may not be as accurate as using a tension or force gauge. The three forces acting on the plank are tension, weight, and the reaction force from the hinge/wall passing through the point where the weight and tension forces intersect. If you reduce the force to 20 N, the torque is reduced to 16 N · m, and so on. a) Place pivot midway between hinges. (Don't let anybody be snide about your diagram. The hinge rotates but does not move. Problem 29. 10:25mins. The more of the door is on the same side of the force as the hinge, the more inertia that side produces and the slower it accelerates. For an 8' board, the force would be 12 times the weight. Oct 27, 2016 · The Attempt at a Solution. Mar 13, 2014 · Find Hinge Force of Rod Undergoing Circular Motion. Forces Hinges Horizontal. 7î)N is applied to it. The mass of the bridge is 2500 kg. Nov 26, 2022 · This allows for easier analysis of the forces acting on the beam. 3. static equilibriumsituation, in which an object remains at rest. \tau =r\times F=rFsin { \theta } τ = r ×F = rF sinθ. On the right, the supporting force is shown not to be necessarily parallel to the rod. The door is not moving. Assume that the center of gravity is at the geometrical center of the door, and determine the horizontal and vertical force components exerted by each Dec 25, 2016 · Homework Statement: A uniform rod of weight W is free to rotate about a hinge at one end. There are two conditions for any object to be in static equilibrium : 1. There are 533N of force pushing right, and 320N pushing left. Each hinge supports half the total weight of the door. The forces (F) in each hinge are equal. [/latex] Find the forces on the hinges when the door rests half-open. The door has weight, which is in your diagram. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom. 3 m m O / m 5/ mD. Therefore the hinge is able to develop forces to resist the push (reaction forces) in any direction. 40 m from the top and another hinge 0. A small particle of mass M/3 strikes the rod with velocity v at a distance 3l/4 from O and sticks to it. Moment ( N m) = Force ( N) × perpendicular distance from the pivot ( m) The SI unit for the moment is Newton metres ( N m ). The primary function of a door hinge is to connect two solid objects while allowing rotatory movements. 33 A drawbridge. Question by OpenStax is licensed under Mar 1, 2022 · We are rotating it along a fixed axis. The hinge applies a force to the left end of the beam that has a horizontal component and a vertical component . The article clearly describes the different types of hinge joints and a brief idea about all these types along with the different reaction forces which are acting on a hinged body. The angular velocity around the center of mass is the same as the angular velocity around the hinge. 9–69). This may also be Newton centimetres ( N cm) depending on the units given Homework Statement A uniform rod of mass M and length l is hinged at point O as shown in fig. 6kg and the distance from the top hinge to the center of the door is 1. Mar 13, 2014. Angle Beams Wires. 5m high weighs 250N and is supported by two hinges, one 0. A hinge 0. For a revolving door: the center of mass doesn’t moveso there is no net force on the door. We can place Hinge Joint Anchors our selves if needed. The formula for torque is torque = force x distance. Doceri is free in the iTunes app store. Relevant Equations. 4. . Assume that the beam remains. The moment of a force is given by. Each side of a stepladder is 8m long and there is a hinge at the top. The ground holds you up. In summary: Ok, so at the hinge, there is a tension of 210N. The pin hinge exerts a reaction force. (Hindi) Rotational Motion Part 2 - Fixed Axis. 47 meters tall. There may be multiple forces that cancel each other. 1) The hinge applies a centripetal force, which keeps the door from flying off (laterally). com Mar 13, 2014 · The inertial forces are still there, however: ∑F = ma → ∑F - ma = 0 You can interpret the ma term as the inertial force acting opposite to the other body forces. Mar 18, 2009. The word force can take on different meanings—how is it used in science? Learn about what a force is and how a Isaac Newton's Laws of Motion changed the world's view of how forces and motion work. The torque can be calculated by multiplying the force applied perpendicular to the lever arm by the distance from the hinge. Figure \(\PageIndex{8}\): A 400-N swinging vertical door is supported by two hinges attached at points A and B. component of the force exerted on the beam by the hinge. Both hinges have to pull and push the door to properly support its weight. #1. Assuming that the door's center of gravity is at its center, find the horizontal components of force exerted on the door by each hinge. In summary, the conversation discusses Old MacDonald's farm and a squeaky gate, which is 3 meters wide and 2. Share. 0. The force exerted is essentially a contact force like i might exert with my hand on any other object, except the hinge places the force at a specific point. Find the force (magnitude and direction) that the door exerts on each hinge. Force Hinge. By. In summary, a door with dimensions 1. Apr 15, 2018 · Torque is a measure of the turning or twisting force applied to an object. The summation of forces in the y-axis is 0 N, with the normal force from the ground balancing the vertical component of the force applied at the hinge. Zak's If the body is attracted towards the fixed point, when at a distance of 8 cm from it with a force equal to the weight of 10 g, the period of oscillation of the mass about the fixed point is nearly. In general, hinge force acts perpendicular to the surface of the hinge, pushing or pulling the objects in the direction of rotation. For example, gravity pulls you down. 800 m from the hinges, you exert a torque of 32 N · m (0. Just make sure you apply equal and opposite forces on the two parts connected by the hinge. Assume that the Jul 5, 2021 · I know force = torque / distance so if d = distance from hinge to pressure point in feet. Motion with uniform angular acceleration examples. Using a vector diagram with the origin at the hinge point, the equations \sum \tau=0 and \sum Fy = 0 are used to find the tension in the rope and the force at the hinge. May 12, 2021 · SCREENSHOT OF RigidBody and hinge. 30 m and weight 272 N is supported by two hinges, each 0. A. In summary, the problem involves a uniform beam pinned to the ground with a cable attached to its center to support wooden blocks suspended on it. Return to the hinged rod we looked at in Exploration 10. Moments occur when forces cause objects to rotate about some pivot. Kinematics of Rotational Motion (in Hindi) 11:43mins. 7m apart. org May 23, 2024 · The hinge force is important in engineering mechanics to illustrate the free body diagram of a frame which is hinged. However, the weight of the hinge may contribute to the overall normal force In this lesson I have covered Calculation of Hinge forces in case of pure rotational motion. ql yh pt jb ti ht pf ki pl ct