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Questions tagged [torque]

The tendency of a force to rotate an object about an arbitrary axis.

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Why is it easier to put one's arm on table for lifting a box?

Why is it easier to put your elbow on the table to lift a box compared to just lifting it, hand in the air? Is it like some kind of torque or fulcrum and lever?
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1answer
26 views

Using Euler equations to solve for torque

I am trying to solve the torque needed to rotate a rectangular plate of sides $a$ and $b$, about a diagonal with constant angular velocity $\omega$. Euler equations are given by, $$ I_1\dot{\omega}...
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0answers
39 views

Bike on treadmill which instantly stops

As far as I can remember from university physics, to stop a wheel rotating on the spot you need to apply opposite torque which results in a linear acceleration of the whole wheel forward. Now, this ...
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Does the hinge reaction do any work?

I was doing some questions in rotational mechanics and I am not able to understand the concept behind hinge reaction which acts on a rod suspended at a point. I am taking a simple example here. Let's ...
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1answer
25 views

A rod with a ball attached is balanced?

An object is made by hanging a ball of mass $M$ from one end of a plank having the same mass and length $L$. The object is then pivoted at a point a distance $L/4$ from the end of the plank ...
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1answer
52 views

Rod that is toppling over

A rod is about to fall over. If $N=mg$, then there is no resultant vertical force acting on the object. So how is the object able to fall over? Intuitively I understand why it would fall over but ...
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0answers
26 views

Torque e momento angular [closed]

A disco com um momento de inércia de 9,0 kg ⋅ m2 gira como um carrossel sob o efeito de um torque variável dado por t = (4,1+2,6t) N ⋅ m. No instante t = 0,4 s, o momento angular do disco é 7,7 kg ...
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Measure Torque on Servo Motor

I'm trying to measure the stall torque of the EV3 Large Servo Motor. The experiments performed so far, are as follows: Using a Prony brake By letting the shaft rotate freely, and then slowly ...
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0answers
47 views

Metal ring falling over in a magnetic field? [closed]

I'm attempting a problem which has been boggling my mind for a while now. The question is: A round metal ring of conductivity $\sigma$ and density $\rho$ is placed on its edge at an angle $\theta_0 ...
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1answer
29 views

Torque applied off the center of mass [duplicate]

I am trying to solve a problem involving a motor attached to an object. The motor is below the centre of gravity. When the motor is running it will apply a torque off axis to the object. What will ...
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0answers
26 views

Gyroscopic Motion

Why does a spinning Gyroscope does not simply oscillate in a vertical plane, the way a non-rotating one does? How can high spin angular momentum/velocity overcome the dynamics of a system? Why does ...
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1answer
49 views

Perpendicular weight force on an object that is tipping over [closed]

I'm currently working on a problem I can't seem to find an answer to. I have an object that is hanging over a cliff. This object is exactly 12m in length, and it starts off in equilibrium (6m over the ...
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2answers
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Can anyone explain me how do I calculate torque?

For my gate automation project, I estimated the amount of force required (in order to estimate the torque) to pull my gate with a spring balance. The display on the spring balance read $2 \text{ kg}$. ...
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3answers
70 views

Torque on a shelf

Say I have a shelf anchored to the wall (how it's anchored doesn't matter here I think), with a mass (m) taking up most of the space on the shelf: Say the shelf is x meters long, and the mass is y ...
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1answer
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Normal Force on an object hanging over a cliff [closed]

this is the problem I'm having: Imagine I have an object with mass m, also with equal distribution of the mass. This object is portruding over a cliff, with some fraction of it being suspended over ...
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2answers
69 views

How to calculate the weight of a TV, mounted on a different type of brackets and positioned at different swirling angles? [closed]

The problem: So basically I want to calculate the weight/pressure of TV that I want to mount on my wall so I can on my own later on find the right anchors, right fittings, and TBH I am interested in ...
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0answers
28 views

Turning and Propulsion of a Tracked Vehicle

My goal is to create a simple simulation of a tracked vehicle. In the simulation, I've decided to omit simulation of the track and instead use a forward drive force and resistance force, a turning ...
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1answer
31 views

Does the centre of mass of a circular object such as a cylinder or sphere rotate? [duplicate]

Say I pushed a cylinder to roll on a flat surface with velocity v, the point at contact with the floor will have zero velocity in order for the cylinder to not slip - which implies the point at ...
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3answers
47 views

Why does the force of a torque applied on a cylinder of mass $m$ at an arbitrary point equal to $F=ma$ circumference?

For the question I attached I can't seem to understand one part of it and my friend and teacher can't seem to explain it too. I've included the solution with my understanding of what's happening. The ...
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0answers
64 views

Lagrangian of the Euler equations - why are Lin constraints required?

The following equation describes the motion of a rigid body rotation, such as a gyroscope: $$ \frac{d\textbf{L}}{dt} ={\bf{\tau}}= \textbf{r}\times m\textbf{g}= {\omega}\times \textbf{L}$$ where $...
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0answers
20 views

Gyroscope precession direction of torque

On the opposite side of the rotation vector direction [L], when i applying force upside of rotor surface(dotted line) Why the generated torque cause the rotor to rotate counterclockwise? when i apply ...
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2answers
58 views

Why are tail rotors in helicopters vertical?

I guess spinning in perpendicular direction to main rotor is better in counteracting the torque but what's the mechanism at work?
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0answers
39 views

Gravitational attraction between a particle and a bar

I'm trying to solve this problem from the book "Fundamentals of Applied Dynamics" by R.A.Tenenbaum. I start it by trying to find the resultant gravitational force by the means of integration. $$d\...
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1answer
48 views

Proof of the Law of the Lever

Is there an accepted proof of the Law of the Lever? I know of several attempted proofs, such as Archimedes's, but these either are incomplete or do not transfer to the setting of Newton's Laws. (It ...
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0answers
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P = τ*ω? - Finding Rotational Power Via Instantaneous Torque & AngVelocity? - Problem with units

I set up an experiment with a uniform rod pendulum swinging on a hinge and the hinge attached to a small PMDC generator. The generator has no load attached and its output voltage is proportional to ...
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0answers
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How to calculate torque for a linear slide pulley?

I have a linear slide pulley system like in the picture (the string on the right will be attached to a spool, which is attached to a motor) and I'm trying to determine the right motor to buy to power ...
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1answer
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What do we mean, concretely, by the unit $\rm N\:m$ (newton $\cdot$ meter)? [duplicate]

What do we mean, concretely, by the unit $\rm N\:m$ (newton $\cdot$ meter)? For example, $1 \:\rm m/s$ mean that each second, we make one meter. Also, $1\:\rm m/s^2$ mean that each second the speed ...
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1answer
24 views

Direction of Torque and Sign Convention

I am already aware of the right hand rule to determine the direction of torque. I am a bit confused however regarding the sign convention used during this process. If the torque is into the plane, ...
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2answers
79 views

How would I draw the forces on two identical ladders propped up against each other, connected by a rope?

Two ladders of uniform density and equal mass m are propped up against each other at angles $\theta$ from the frictionless ground. A rope of tension $T$ connects the two horizontally a distance $\...
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1answer
40 views

Why does the axis of rotation of a thrown football rotate downwards as it travels along its trajectory?

When a quarterback throws a pass, the football is angled upwards relative to the surface of the field, but progressively rotates downwards along it's path of travel. When initially released, I can't ...
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1answer
24 views

Ratchet handle force calculation

I have strap ratchet which is being pulled on both sides with some force(say 500lb). Could some one please help me know the force to be applied on the handle of the buckle to open it? Can anyone ...
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2answers
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Does the depth that the accelerator pedal is depressed correspond more closely to the force or the power that the engine delivers to a car?

Consider a car that only moves directly forward without turning (so that we can model its trajectory as motion in one dimension), and assume we can neglect both air resistance and the frictional ...
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2answers
26 views

Relationship between speed and power in wind/hurricanes

I was looking at hurricanes today when question crossed my mind. Cat 1 Hurricanes are the ones going up to 95mph. Cat 5 goes above 157 mph. That says a lot, but not all. In motors or engines, RPM ...
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4answers
174 views

Axis of rotation of the body [closed]

A couple is applied to a rod such that the forces are at equal distance from the centre of mass of body. The body will rotate about an axis through its centre of mass. However, if the couple is ...
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1answer
59 views

Torque of disk about a point when there is a force acting on the disk surface? [closed]

As the picture shows, the force F acts on the solid disk at the contact point $t$. In this case, how do we calculate the net torque about the point $O$, mainly the contribution of F to the net torque. ...
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2answers
53 views

Non-zero torque for a part of rod in equilibrium? [closed]

Suppose a vertical rod of $L$ length has force $F$ acting towards right, on top and bottom positions. A force $2F$ acts towards left on the centre of rod. The body is equilibrium. Let's take the lower ...
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1answer
72 views

Is torque always equal to the derivative of potential energy with respect to rotation angle?

For any three-dimensional rigid body, the applied torque on that body is defined as: $\vec{\tau} = \vec{r} \times \vec{F}$ where $\vec{F}$ is the applied force on the object (i.e. $-\vec{\nabla} U$) ...
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1answer
64 views

Conservation of angular momentum during rolling with slipping [closed]

A block of mass m moves with a velocity $\mathbf{B}$ on a smooth horizontal surface. It then passes over a cylinder $R$ and mass $m$, capable of rotating about it's own axis through $O$. The block ...
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2answers
55 views

If a gyroscope is provided a torque in space, what will its motion be after the torque ceases to act?

As there will be no energy dissipation, where will the kinetic energy of precession go as the gyroscope can't precess in the absence of a torque? Thanks in advance!
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1answer
34 views

Stability of differently shaped gyroscopes

1) Would it be correct to state the following: "The longer the radial distance (the distance from the center of the gyro disc) and the lower the height from ground to disc, the greater the angular ...
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2answers
189 views

How to find the axis with minimum moment of inertia?

If a system of particles is given, in a 2D plane, with particles having masses $M_1$, $M_2$, $M_3, \ldots M_n$ and coordinates $(x_1,y_1)$, $(x_2,y_2)$, $(x_3,y_3), \ldots (x_n y_n)$, then how can one ...
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1answer
38 views

Torque acting on car trailers

My question: "Which car trailer below will be moved in a straight forward line?" Relevant info: All forces (represented by the arrows) in the diagram are equal in magnitude. The car trailer diagrams ...
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5answers
109 views

If a torque stops a wheel from spinning, will the wheel continue to move forward without spinning?

If a torque applied on a spinning wheel stops a wheel from spinning (on a horizontal surface) will the wheel continue to move forward without spinning?
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1answer
26 views

calculate the time elapsed for a robot to pass certain distance with a load [closed]

For a robotics project I wanted to find the optimal gear ratio for my robot to travel 10 meters. Unfortunately. the acceleration is nonconstant, and that proved to make my life much harder. I think I ...
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1answer
53 views

What are the effects of diameter and width on a wheels ability to move on soft surfaces?

Often larger tires with a greater thickness are used for moving across soft surfaces such as sand. In relation to the diameter and width of tires, how do these properties provide better movability on ...
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2answers
57 views

Why are there sine and cosine in the magnetic dipole moment (in the torque formula) of a rotating conductor loop?

I'm trying to redo the textbook example in magnetostatics. The current carrying loop is affected by a magnetic flux in the ax→ direction. While trying to find the torque on sides ab and cd for figure ...
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3answers
46 views

Why do vehicles with a higher center of mass roll more easily considering that they have a higher moment of inertia?

It is a well known fact that cars with a higher center of mass roll over more easily, but why is this true considering that higher center of mass = higher moment of inertia? I understand that the ...
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1answer
51 views

Class I lever: force needed to rotate slab into socket [closed]

I have a 5m-long cuboid slab weighing 1000kg, which I would like to lift (from one end) into a socket cut into the ground. The slab is already resting at 10 degrees from horizontal and the fulcrum (F1)...
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1answer
34 views

How much torque do I need for my automated blinds? [closed]

I need to buy a motor for a automated blinds project. Pulling down on a fish scale attached to the blinds, I got a read of 3.5kg (I believe this means 34.32 newtons was necessary). The drum diameter ...
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0answers
19 views

Movement of center of mass in space when torque is applied

If I understand it correctly, the center of mass is defined as the point that when there are forces applied on a body,the sum of the external forces (because the internal cancel) act on this point as ...