Questions tagged [torque]

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

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4answers
223 views

The nature of torque as a vector

I can’t comprehend torque’s role properly: 1: What is torque’s nature? Is it some kind of energy? Because its unit is (n.m) and (n.m) is similar to (joules) and it’s energy unit. 2: As we all know “...
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1answer
33 views

Wheel size for climbing up on inclined surface

I am going to make a Line follower robot which can climb up on a inclined bridge(45 degree with flat surface). If speed remains constant, Should I use bigger wheel to enable the robot to climb easily? ...
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0answers
50 views

Torque on a quarter-wave plate… Where is the force? Where is the moment arm?

If you shine circularly polarized light (carrying angular momentum) through a quarter-wave plate, the light will emerge as linearly polarized light (carrying no angular momentum) from the other side. ...
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0answers
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Transverse speed of hamster in wheel as function of theta

i need help with conceptual understanding of how this system works. A small animal is running in a wheel with radius R, (and 0 mass). When the animal is at an angle $\theta = \alpha $ measured from ...
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1answer
125 views

Torque required by a motor: using a counterweight to reduce?

I have a motor and gearbox that is rated for a certain amount of torque in newton meters. Its primary load $M_1$ is connected by a rigid rod (assumed massless) length $L_1$. So I reckon the (max) ...
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2answers
81 views

Would a force not cause acceleration $a=\frac{F}{m}$ if part of it is used to cause rotation?

Let's say we have a massless rod of length $2\,\mathrm{m}$ that has a $1\, \mathrm{kg}$ ball at one end and another $1\,\mathrm{kg}$ ball at the other end.$$ \begin{array}{c} {\displaystyle{~\large{{\...
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1answer
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Gyroscope physics

I'm not a physics student, but am attempting to better understand gyroscope physics. Also my first post here. So, I'm looking at this site, at the second diagram with F_1 and F_2, and reading the ...
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4answers
1k views

What is a moment?

As a 8th grader I am still a newbie at science and I have problems understanding the forces that I can not imagine and one of these "forces" is the moment. We are told that, $$\text{moment}= Nm$$ ...
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2answers
94 views

balancing a weight on a table without tipping over

I have a statics problem. Here is a model for a table: a circle of radius 1.5 ft a pole in the center a base in the shape of an X. I place a weight on the table on the edge. How much weight can ...
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1answer
83 views

Finding the state space representation of a dynamic model with the force and angle as control inputs vector

I am trying to design a controller to control the angle of the force on my mobile rigid body. I some questions: I am not sure how to write the state space representation with the force, $F$ and angle,...
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2answers
34 views

How to measure change in degrees per second, given force applied at a certain angle? [closed]

Example: a rectangular spaceship weights 10.000kg, and has a lenght of 20 meters. A force of 1.000 newtons is applied at a 90° angle and 9 meters away from center of mass. What will be the change in ...
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1answer
85 views

Which equation should I use to find torque?

I'm designing a ball launcher that uses 2 wheels to accelerate a ball: Each wheel is driven by its own motor. I selected a desired speed for the balls to be launched at, $v_{\text{ball}}$, and so I ...
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3answers
260 views

Torque - Why does a block topple and net torque when net force is non-zero?

Suppose there's an inclined plane with friction $\mu$ (possibly $\mu = 0$), and there's a rigid cuboid block on it. Now while it's physically intuitive to me that the block will topple over only when ...
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2answers
88 views

If the torque caused by a force is cancelled out, is the force cancelled out as well?

I calculated the value of $\theta$ to be $53^{\circ}$ for (ii) by using the principle of moments ($6\sin\theta r 2 = 2.4 r$ ) as the disc is in equilibrium. Nothing wrong so far. For (iii), I ...
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0answers
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Calculus of torque to move a small vehicle

I have a to choose two DC motors in order to carry a vehicle. I assume that the mass of the whole vehicle (all components included) is 1Kg, the surface is flat and made of wood, the wheel coupled to ...
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1answer
44 views

Unusual Door Mechanics At Play [closed]

We have a door in our Applied mathematics lecture venue, that seems to open and close itself randomly (at about a 1-2 min interval). The door is not electrical and there is nobody pushing it from ...
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1answer
32 views

Adding momentum to pulling force

A winch is pulling a 90kg object in any direction but it is limited in potential speed by its torque. Would a burst of momentum by perhaps a coiled spring or jet propulsion pushing the object towards ...
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1answer
215 views

Pivoted Rod Problem [closed]

Hi this question popped up on AP Physics C practice test, and I keep on getting T = mg/2 through equilibrium. I got the torque from gravity is mgsinthetaR/2 and the torque from the Wire is TsinthetaR, ...
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1answer
553 views

Static equilibrium- when do you use forces and when do you use torques?

I'm working on an answered physics question in the book but I'm having trouble understanding why the problem could be solved by setting net torque equal to 0 and not net force. You are asked to find ...
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1answer
102 views

Formula for rotational work

I read online that rotational work is defined as $$W =\int \tau \mathrm{d} \vartheta$$ which is not exactly the same as $$W = \int \vec{F} \cdot \mathrm{d}\vec{r}$$ So i was wondering if it possible ...
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2answers
284 views

Torque/Rotation & Sliding with Slipping

A student holds one end of a thread, which is wrapped around a cylindrical spool, as shown above. The student then drops the spool from a height h above the floor, and the thread unwinds as it falls. ...
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2answers
105 views

Angular momentum paradox

I want to analyze the following system, where the mass of the axle is negligible and the Wheel is spinning. In particular I need to calculate the amount of torque about the point where the string ...
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1answer
147 views

Can the reference point in an inertial frame be accelerated when applying torque equation?

Torque about a point = rate of change of angular momentum about that point. Say we're in an inertial frame and see a body accelerating and rotating and another point(either a part of this body or an ...
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1answer
254 views

Angular acceleration in rigid bodies

This is a concept which is bothering me a lot. I'm sure there are other duplicates to this question but on seeing a few such duplicates, I haven't yet obtained an answer. My question is, for a rigid ...
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2answers
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How to apply right hand rule to determine the direction of Torque?

I have just started out rotational dynamics but after solving a few questions I found that most of the answers are coming to be wrong because I could not determine the direction of torque correctly. ...
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1answer
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Question about aerodynamic drag

It is a problem about aerodynaic drag. The following is the formula. $d{\vec{f_{drag}}} = -0.5C_{D}{\rho}{V^2}{({\hat{n_{i}}}\boldsymbol{\cdot}{\hat{v})}{\hat{v}}dA_{i}}$ ${\vec{T_{drag}}}=\int{\...
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What stresses should be considered to determine the effective stress and FOS?

This question I tried to solve by considering the torsional shear and transverse shear and axial loading. But the answer is not clear. But the answers that I got by different trial and error method ...
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4answers
748 views

Why does a leaning bike not fall over?

This question has been bothering me for a while now. Everywhere I look, everyone talks about 'fictitious forces' and how they apparently explain the bike being in equilibrium. However, if we just look ...
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3answers
413 views

Will an off-center force cause an object to rotate if there is no resistance? [duplicate]

I am currently taking an engineering course in statics and my teacher is insisting that an off-center force will NOT cause a free object to rotate. This goes completely against my intuition. Here is ...
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1answer
82 views

Expressing the magnitude of torque using dot product

I wanted to know if it is somehow possible to express the magnitude of the torque vector about some axis using some dot product of other vectors in the system (the position of the object, the axis of ...
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0answers
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How to increase power in a geared system using P = (omega)(torque)

Could someone give me a basic, intuitive explanation on how to increase power in a geared system using the P = omega*torque formula? By geared system I mean two connected gears, where the first one ...
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2answers
361 views

Concept of work done by torque

I know the derivation of work done by torque. But all I'm curious to know is when is WORK DONE BY A TORQUE positive and when is it NEGATIVE?
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2answers
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Can we take rotational equilibrium of only one part of a body?

Can we take rotational equilibrium of only one part of a body? Such as in a step ladder, where BD is a rope. Can we take rotational equilibrium of AC about C, and not the full ladder?
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2answers
56 views

Why does the bench in this image stop rotating even tho the torque in the left is higher, and what formula is used to calculate torque in this case? [closed]

https://imgur.com/a/N07c8 since the the lever is balanced shouldn't the torques on both sides be equal? if so, how are the torques calculated in this case
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2answers
60 views

Moment (torque) problem [closed]

Why in this figure the total torque on object is not zero as one force cause the object to move in clockwise direction and the other force cause the object to move in anticlockwise direction ? How ...
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1answer
36 views

Unknown $c$ in torque equations [closed]

In a book I have come across a couple of unrelated equations with an unknown $c$, in equations of the form $$T_{en} = \frac{P_{en}}{2\pi n_n}c,$$ where $T_{en}$ is torque, $P_{en}$ is rated power and $...
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1answer
54 views

Torque in a stone [closed]

If force is applied tangentially where does centripetal acceleration comes from because it is directed toward center and force applied is tangential?
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1answer
600 views

The moment of inertia of a spinning gyroscope assembly

Moment of Inertia (MOI) is typically used to describe a rigid body, so I don't know how well I can express my question in those terms. However, it seems like the best framework for getting at my issue....
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2answers
62 views

Why slanted bodies slip, what is causing the acceleration?

Let the body be a ladder, it is held at slanted position with base on the floor. If it is leaved, with zero velocity, then why it's base slips backward when the upper part of the ladder is falling ...
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0answers
40 views

How to account for forces between connected bodies?

So lets say that I have a system which consists of two 1kg spheres (1 meter radius) which are connected by a massless rod which keeps the centers of the spheres at a fixed distance of, say 10 meters. ...
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1answer
66 views

Mechanics torque about a point [closed]

I am having trouble with this question, especially those 30 mm at the bottom make it extra hard. I do not have a clue how to solve this one...
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2answers
206 views

Can/Does angular momentum apply a torque?

Context I'm a psychologist and I'm interested in perception of gyroscopic forces. For that reason, I'm having to think about many of the classic issues relating to gyroscopes in reverse. That is, ...
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2answers
413 views

Balancing an orange on a spoon experiment

I did a little experiment with balancing an orange on a spoon. And i realized i don't really understand why i feel a stronger force under both fingers, the further my forefinger is from the orange (...
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1answer
1k views

How to calculate the power produced by a single cylinder petrol (car) engine at a certain rpm? [closed]

I want to know: What are the main parameters that make power/torque generated by engines different and what makes some engines more efficient? (except friction and things like that!) How do I ...
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0answers
148 views

Torque transmission in a gear system [closed]

A gear system is composed by: a central gear (thin disc) of radius $R_1$ and mass $m_1$ whose rotation axis pass through his center O; two satellite gears (thin discs) of radii $R_2$ and masses $m_2$....
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1answer
31 views

Direction of torque in this situation [closed]

Suppose a body is rotating with uniform speed i.e. dv/dt=0(all the drags and frictions are zero) then what will be the direction of torque or will it actually exist?since the only force is acting ...
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1answer
111 views

How to relate spin speed and time in which a gyroscope falls beyond some angle?

Usually physics books calculate the precession rate of a gyroscope when its momentum wheel is spinning "fast enough." I am looking for an equation to calculate the wheel speed whereat a gyroscope "...
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1answer
234 views

Shear stress of a suspended sphere in a viscoelastic fluid

What I am trying to solve right now is that I have a magnetic particle (nanoparticle to be exact) floating in liquid that is viscoelastic and apply sinusoidal magnetic field. The applied magnetic ...
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3answers
146 views

Why does it get harder with time, to rotate a screw with a screwdriver?

A couple of forces act on the machine screw and create the turning effect. But after sometime it gets harder. So, net torque is decreasing, but why is it decreasing? Frictional force comes into action,...