Questions tagged [torque]

This tag is for questions regarding to Torque which is a measure of the force that can cause an object to rotate about an axis.

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54 views

What physics properties and equations can explain these changes in 3D Axis of Rotation?

Background Programmer whiteboarding to refactor code that selects pivots and axes in 3D rotations based on location and direction of external forces. Consider for example a cuboid lying on the floor. ...
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Why does the gyroscope oscillate a little when it just starts to precess?

I was reading up on why before starting the precession the gyroscope "goes down a little", (Link at the bottom). In this paper, while looking at the graphs I observed that before reaching ...
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Meaning of torque

So, in the diagram, A is the axis of rotation and the net moment from the forces acting there(as shown) is 6Nm.The moment is due to the forces acting in the direction as shown and the moment the ...
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1answer
19 views

Are the lift and drag force on a wind turbine blade responsible for torque development?

Is the lift and drag force on a wind turbine blade are responsible for torque development? I understand that the torque and thrust are the decomposition of the net aerodynamic force on the turbine ...
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2answers
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If lower gear generates more torque at the wheel, why does it generate less acceleration/speed of the car compared to higher gear?

If lower gear generates more torque (compared to higher gear) at the wheel, that would presumably mean the wheels can exert more force on the floor to propel the car forward. Thus, why does lower gear ...
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How to calculate the maximum bending stress? [closed]

So how to calculate the maximum bending stress? Question: The beam is constructed using the timber cross-section shown. The beam is $115 \text{mm}$ wide and $600 \text{mm}$ deep and is bent about the $...
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3answers
68 views

The unit of Torque [duplicate]

Whenever we define a physical quantity, we know what 1 unit of that quantity tells us. For example, when we say 5 Pa, we're saying 5 N force acts perpendicularly on every unit area of the material but ...
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21 views

Does a hinged body rotates over its centre of mass if seen from the frame of centre of mass?

I know that if an unhinged body have some constant net force and some net torque it will rotate about its centre of mass and translate at the same time. Does a rotating hinged body also rotates about ...
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How can rotation be produced if moment of force of reaction is zero?

My book mentions that: The moment of the force of reaction about the pivot is zero because its distance from the axis of rotation is zero , The pair of forces formed by the external force and the ...
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1answer
41 views

Calculating linear acceleration from torque in a car [closed]

For fun, I'm trying to play with really simple simulation of a Tesla Model 3. Modeling its acceleration and such. But I've hit a roadblock early on despite validating my math several times. What I ...
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How is the torque about any two reference points (in the system) when a body is in translational equilibrium of same value?

Here's what the textbook says The equilibrium condition for the torques is true for any choice of the axis about which the torques are calculated. To prove this statement, we consider a rigid body on ...
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Why is it easier to close a door if you're pushing further from the hinges [duplicate]

It's much harder to closer a door if you push near its hinges as opposed to pushing at the edge of the door. I understand that this is because the torque is calculated by $r \times F$, but I'm trying ...
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Would a set of very massive spinning disks on the lowest points of a ship increase its inertia to ocean waves?

Would a set of very massive spinning disks on the lowest points of a ship increase its inertia to ocean waves? As ships are filled with an enormous mass of balast water which is not enviroment ...
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Friction between two horizontal rotating discs

Let's say we have two rotating disks and one disk is given some angular velocity. As one disk rotates, due to friction the other disk should rotate as well. The two disks are completely identical (...
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Free body diagram and equilibrium of a differential-drive mobile robot

I'm trying to study the free body diagram of this differential-drive mobile robot: So i started considering just a straight motion (torque on the right wheel is equal to the torque on the left wheel) ...
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Existence of torque on a dipole due to magnetic field even is the force on a magnetic dipole is zero

In chapter 7 of Introduction to Electrodynamics by David J. Griffiths, the author states the torque $\mathbf{N}$ on a magnetic dipole due to a magnetic field $\mathbf{B}$ is given by $$ \mathbf{N} = \...
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Analytically proving that the yo-yo rolls to the right (angular kinematics)

Assume that the yoyo is always rolling without slipping. Physical experiments shows that the yoyo would roll to the right. I'm aware of some ways to show this without analytically solving the system (...
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What is doing the work on a magnetic dipole in a magnetic field?

I understand that the torque acting on a magnetic dipole in a magnetic field is given by $$\vec\tau=\vec\mu\times\vec B \therefore \tau = \mu B sin\phi$$ It follows that the work done as the dipole ...
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1answer
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How Can I Understand The Resulting Movement of this Situation Using Cross Product Based on Geometry?

I am at the moment writing a script for a video talking about angular vectors and how to find them in discussion about how a top stays upright. Currently, I am relating equations like $\vec v = \vec \...
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3answers
52 views

Can we use any point for finding torque? [closed]

I wanted to know whether we can find torque about any point? For example consider a rolling disc with constant acceleration. We can find torque about instantaneous axis of rotation or about centre of ...
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51 views

Torque exerted by internal forces

I'm a student studying classical mechanics and ran into some trouble with the topic of rigid body rotation. The formula τ=Iα for rigid bodies, where τ is the torque exerted by external forces about ...
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1answer
35 views

Torques In Gears

I had a question regarding the gear ratio of spur gears. Assuming that the gears mesh properly (roll without slipping), I was taught that the ratio of the torques acting on the gears is equal to the ...
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2answers
48 views

Calculating the cross product of 2 vectors without using the torque formula

For the scenario described as the follows: Two vectors $\vec{s}$ and $\vec{t}$ lie in the xy plane. Their directions are, respectively, a° and b° measured counterclockwise from the positive x axis. ...
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4answers
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Theoretical explanation for why torque is dependent on the lever arm? [duplicate]

We know that the formula of torque is $\tau=Fl$, where $l$ is the lever arm of the force $F$. I am wondering why is torque dependent on the lever arm? I suspect that it's initially concluded based on ...
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Trouble finding the lines of action

The description for the following picture is: "The figure shows the lines of action and the points of application of two forces about the origin O, all vectors being in the plane of the figure.&...
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1answer
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For how long does the force in $τ=rF\sinθ$ exert on the object that it sets into rotation?

When calculating torque using formulas such as $τ=rF\sinθ$, is the force $F$ exerted on the object for an extended period of time (i.e. the force is still exerted on the object even when the object is ...
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86 views

Will a beam floating in space bend if a net torque is applied?

Imagine you have a simple, uniform beam floating out in space and you apply a force to the end of it. Somehow, you are able to constantly apply this force normal to the surface such that the beam is ...
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28 views

Regarding the direction of $\vec{\tau}$

It's said that the direction of $\vec{\tau}$ is perpendicular to both $\vec{r}$ and $\vec{F}$. I am wondering what if $\vec{r}$ and $\vec{F}$ don't lie on the same plane, then wouldn't it be that no ...
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Why doesn't the $\vec{F}$ in a torque become $-\vec{F}$ when the coordinate systems are inverted?

For example, for this problem: Consider the object in Fig. 9-2. Invert the coordinate system so that $ x \rightarrow-x, y \rightarrow-y $ and $ z \rightarrow-z $. Clearly $ \overrightarrow{\mathbf{r}}...
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What is the distinction between work done by torque and force about an axis other than centre of mass?

Suppose a point particle is undergoing circular motion about a fixed point such that a tangential force is accelerating its speed continuously. Now I believe that I can calculate the work done on this ...
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1answer
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Why we only need to consider one component of the torque vector when we consider only cases in which the rotational axis is fixed in direction?

In my textbook, it is said that "we will consider only cases in which the rotational axis is fixed in direction. As a result, it will be necessary to consider only one component of the torque ...
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Angular Momentum for collection of particles: question on Wiki proof

I'm following the Wiki page on angular momentum for a collection of particles. What should $\mathbf V$ be defined as in terms of the collection of particles with $\mathbf v_i$? $\mathbf V = \mathbf ...
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Moment of Inertia of Rolling Concentric Disks

Imagine I have 2 concentric disks, one with radius R1 and the other with radius R2, each one with homogeneously distributed masses M1 and M2 respectively. If I apply a moment on the disk by pulling on ...
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2answers
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Calculating torque from angular displacement (as a function of time) [closed]

I am an Engineering student studying for a physics exam later this month and came across this problem: It is given, that an angle to a point on a rotating wheel can be described using following ...
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1answer
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Is the definition of Work done by Torque a general result?

I was going through this post. In the post the person who asked the question mentioned a statement: "Lastly, I am emphasizing that I'm am NOT saying that torque is incorrect, only that the work ...
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29 views

Express torque as 3d vector (calculating the applied force vector)

I do not know a lot about physics. My goal is to express torque as a vector in 3d space. I know it is the cross-product of the radius vector and the force vector. My question is: if torque is the ...
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210 views

Why is distance taken to be perpendicular to the direction of force when calculating torque?

According to my textbook: Moment of a force = force $\times$ perpendicular distance of the line of action of the force from the fulcrum. I don't understand why it would be that way (especially what ...
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1answer
42 views

Help understanding part of slipping and rotation problem

A disk of mass $M$ and radius $R$ is initially rotating at an angular velocity of $\omega$. While rotating, it is placed on a horizontal surface whose coefficient of friction is $\mu = 0.5$. How long ...
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Plotting normal forces after the tipping point

A uniform beam resting on two pivots has a length L=6.00 m and mass M=90.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot located a distance l=4.00 m from ...
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1answer
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Length of rod given forces and lengths to calculate torque [closed]

In the question and solution given below, I haven't understood why is the solution asking us to take torques about the center of mass. In my approach I equated the net torque about the lower end B of ...
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Is this visualisation correct for the transfer of momentum to rotate a body?

Is this visualisation correct for the transfer of momentum to rotate a body?Is the example on 2b what happens when we try to open the door pushing too close to the hinge as a pivot point? I draw a bar ...
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Why do object rotate at all?

So I realize I am asking a pretty obvious, intuitive question. All of us have witnessed object rotating in everyday life when we nudge/push them from the side (not from the centre of mass of the ...
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Force and torque provided by a string on pulley

Suppose there is a pulley of mass m and two blocks are suspended on both sides of the pulley. Now what are the forces that the string applies on the pulley? I can visualise the normal force acting ...
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3answers
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Will a disk (or any rigid body) without fixed axis on a frictionless surface rotate?

If there is a disk (or any non-particle object) placed rest on a frictionless table, and a force is applied on its rim. Will it rotate and have translational motion, or will it only have translational ...
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Hubble telescope: forces and torques due to radiation pressure

The Hubble telescope spacecraft uses six rate gyroscopes for orientation sensing. It is well known that even the best inertial measuring units accumulate drift or integration errors due to bias and ...
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What is the best length ratio between 'tongue' element of the brick and brick wideness shown on this picture?

What is the best length ratio of 'tongue' element of the brick to brick wideness shown on the picture to resist an ertquake stres? Should the ratio be less than 1:2 as the tongue should feel higher ...
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How to find the line of action of the net force resulting from a horizontal and vertical force acting at two different centers?

For a homework question, I have to find the hydrostatic forces on a floodgate, which is inclined at 60 deg from the horizontal, at the end of a pipe. I have solved for the vertical (4,444 N) and ...
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Torque on a system of dipoles [duplicate]

I know that the net force on a system of dipoles is zero because internal forces cancel out, but the same is not true for the torque. I wanted to know why does this happen. And is it related to any ...
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1answer
15 views

Work done in unwinding of a chord, wound around a disc

As I understand the work done in case of circular motion is the product of torque and displacement. Let's say the amount of chord that is unwound is x and torque be t, in my textbook I'm given the ...
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Calculate Torques & Forces From Jacobian Matrix

Dear Physics Stack Exchange, I am trying to calculate the torques and forces for a 2DOF robot. I’m used the partial differentiation method to find the Jacobian matrix. I managed to find the ...

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