# Questions tagged [torque]

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

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1answer
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### 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 ...
2answers
245 views

### 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 ...
2answers
57 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 ...
4answers
293 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 ...
1answer
174 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. ...
2answers
94 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 ...
1answer
226 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. $-\vec{\nabla} U$) ...
1answer
80 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 ...
2answers
193 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!
1answer
44 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 ...
2answers
935 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 ...
1answer
47 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 ...
5answers
132 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?
1answer
47 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 ...
1answer
64 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 ...
2answers
304 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 ...
3answers
133 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 ...
1answer
79 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)...
1answer
187 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 ...
0answers
885 views

### What causes this corkscrew-shaped object to rise up in a stream of water falling down?

A corkscrew-shaped object is floating in a tub of water. When water is poured into the tub from some height, the object starts rising up vertically in the stream of water. The water stream is falling ...
1answer
369 views

### Minimal angle that will cause a cube to tip on an inclined plane

Let's say that I have a cube with side $a$ and a ramp such, that the coefficient of friction between the cube and the ramp is $\mu$. I want to determine the minimal angle of inclination of the ramp ...
1answer
377 views

### when braking a car, why do the brakes heat up?

My understanding is that if the car isn't slipping, that static friction at the point of contact between the tyre and the car is what decelerates the car, counteracting the torque which is being ...
1answer
135 views

### Does a Helix shaped object floating in water stream rotate?

A Helix shaped light weight object is placed a water stream. Does it rotate? It is pushed by water body, will it also experience turning force and thus rotate?
1answer
319 views

### Tipping angle of a box [duplicate]

how do you calculate the tipping angle of a box? That is the maximum angle a which a box can reach before tipping over. help, please!
3answers
1k views

### Why do things spin?

Let's say I have 2 boxes, one of mass M and one of mass 2M. They are separated by a distance of 1 meter. I drop them from the same height and see that due to the earth's gravity, they accelerate at ...
1answer
478 views

### Gyroscopic precession - Angular momentum in vertical direction

In the classic example of gyroscopic precession, the wheel starts to process, and now acquires a angular moment also in the vertical direction. Initial angular momentum was in a single plane. The one ...
3answers
201 views

### How is it possible to calculate the moment of inertia?

I would like to calculate the angular acceleration of an object on which a force $F$ is applied at point $P$. The scene is 2D, and the complex object consists of many axis-aligned rectangles. I ...
2answers
59 views

### Centre of Mass and Reference Point

When calculating the centre of mass for a small body compared to the earth, the equation $$\vec r_c = \frac {\sum_i m_i \vec r_i} {\sum_i m_i}$$ is used, where $\vec r_c$ is the position vector for ...
1answer
129 views

### Ideal rolling with friction - torque perspective [closed]

So, let's take the situation where a perfect cylinder or ball is rolling, without slipping, to the right. The ball is rolling clockwise from our perspective viewing it rolling to our right. There's a ...
1answer
39 views

### relation between input and output torques for a geared machine

what is the torque in both ends of this gear set ? thanks! Multiple speed gear paradox box https://www.youtube.com/watch?v=bIMDtkm_ENQ
4answers
45 views

### What does it mean for a force to “go through the center of mass”?

In Chapter 19 of Feynman's Lectures on Physics, Volume I, it says ...where can we apply a single force to balance the gravitational force on the whole thing, so that the entire object, if it is a ...
1answer
184 views

### How to decide the axis of rotation? [closed]

The question The Solution Part (c) is where I have a doubt ... How do I approach such problems? They way I approached such problems (and most of them had sufficient friction so that that the ...
2answers
184 views

### Explain translation and rotation in empty space

There is a previous question of mine which asks about rotation in empty space. Please look at previous question for greater understanding of this question. Explain rotation in empty space My ...
2answers
990 views

### Varignon's theorem (Principle of moments) failure?

Varignon's theorem states that "If many coplanar forces are acting on a body, then the algebraic sum of torques of all the forces about a point in the plane of the forces is equal to the torque of ...
1answer
102 views

### What is the physical meaning of torque about an axis outside the body?

Suppose for example that we have a ladder in space and it has zero translational motion, but non-zero rotational motion and non-zero angular acceleration around its center of mass. The ladder is ...
1answer
390 views

### Torque exerted by pressure in a fluid

If I have a solid rigid body (let us call it a duck) in a static regime submitted to the forces of pressure $P$ of a fluid (no shear forces) I can easily calculate the total force $\mathbf{F}$ exerted ...
1answer
66 views

### Why do two bodies affect each other with the same but opposite torque?

Update: After further reading, it looks like the torque $C_{12} = C_{21}$ should not be seen as caused by the force $F_{12} = -F_{21}$. The resulting force at the contact point causes an independent ...
2answers
156 views

### How to nullify effect of Centrifugal force/centripetal force

I have a track over which a rectangular object moves. The object holds sensitive material which should not move too much. Then there is a 90 degree turn of the track with some radius of curvature. ...
3answers
1k views

### Is there a possible solution here to who carries more weight? [closed]

I am usually skeptical of riddles online that have to do with Physics but this one struck me as they had an oddly specific answer to it. So my question is for the following picture: I simplify a bit ...
1answer
81 views

### Need help in calculating the pull on string in kgs when moving weight on horizontal bar

need your help. I realized today, if you do not practice it becomes hard to understand simple concepts even you were once a science student :( I have attached a picture to help make the problem ...
1answer
95 views

### Is there a contradiction with the frictional force acting on a rolling wheel on a flat surface, if you consider both the net force and the torque? [duplicate]

I have had a physics problem on my mind for a few days and it seems relatively simple at first, but it has been puzzling me, and I was wondering if you could help. Say a student rolls a tire on a ...
2answers
245 views

### Torque Equation for a point other than the axis of rotation [duplicate]

I am having a problem while dealing with the so called torque equation τ=Iα, which I am describing with the help of an illustration. Please help me out. Consider a rod of length L and mass ‘m’ lying ...
2answers
88 views

### Why do cars steer the way they do? [closed]

I'm not sure if this is the correct site to ask, because I could not find other site that suit better. Consider this picture The top-state is the car when wheels are straight. I found on the Why ...
2answers
96 views

### Where does the torque force come from? [duplicate]

If there is an object which is $10 kg$, and we apply a force $|\vec F| = 100N$ then it will accelerate in the diraction where the force vector points with $10 m/s^2$ If the mass center is at point $O$...
3answers
1k views

### Is it possible to apply a torque without a moment arm?

In some statics problems, the question may say something like "a torque is applied about Point B". I've always assumed this was a simplification and the torque was created using a force and a moment ...
0answers
22 views

### Static Equilibrium: cable sag considering equal pulling forces on extremities

When considering a cable with a non-negligible mass and an equal force pulling the cable at both extremities, how can one compute the mid-span sag or a sag function whilst accounting for this pulling ...
1answer
54 views

### What does $T$ in the following notation signify? $F = (F_{rot}, F_{tran})^T$? - 2D Car rotation physics [closed]

I am reading the following paper to help me understand 2d car steering physics. In several places the paper shows a notation where a vector is put to the power of $T$. Like so: I am assuming it is ...
2answers
90 views

### Power in 1st Gear

The max power an engine puts out is what determines the max speed a car travel at right, obviously it's more nuanced than that because there are losses in the drive train, and the shape of the car ...
1answer
47 views

### Free Body Diagram Errors

Click to zoom picture: Why is the force acting down on the hand only $\vec{F_g}$ ? Shouldn't it be $\vec{F_g} + \vec{N}_{object, hand}$ ? Since there is a normal force acting down on the hand from ...
0answers
42 views

### Torsion and Internal Torques of a Stepped Cylinder

I am having some difficulty reconciling what my solution manual says and what I calculating. I would appreciate a peer check on the following. The problem is described by a stepped cylindrical rod ...