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Questions tagged [torque]

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

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2answers
116 views

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
134 views
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1answer
54 views

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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0answers
10 views

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
692 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
370 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
70 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
32 views

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
352 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
88 views

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
55 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
48 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
51 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
571 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....
0
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2answers
60 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
37 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
62 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
191 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
945 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 ...
2
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0answers
135 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
29 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 ...
0
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1answer
98 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
213 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 ...
5
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3answers
141 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,...
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1answer
50 views

Spinning ball gently lowered onto rough floor

Trying to reconcile the real world observation with first principles, here is a problem I came across. Consider a ball initially rotating with axis parallel to the floor lowered gently onto a rough ...
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1answer
114 views

Torque/moment of force fundamentally

I've very much gotten used to calculating the torque about some axis of an object by multiplying the force and the distance from the axis at which the force acts on. We also know that if two opposite,...
0
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0answers
47 views

Angular Impulse in a non-inertial frame

Is $\frac{dL}{dt} = \Gamma$ true in a non-inertial frame? My book states that it is not. Can anyone explain why?
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1answer
90 views

I need help calculating moment/torque of an object [closed]

Heyo! I'll do my best to ask this question as clear as possible, but since English is not my mother tongue it might be hard :D I added the assignment above. S is the point of rotation and the arrows ...
1
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2answers
379 views

Torque applied over center vs. off-center

I have a tool that loosens a bolt with the torque applied over the center of the bolt (box end wrench). I have a different tool that uses a socket which applies the torque (has the ratchet connection) ...
3
votes
0answers
116 views

Relating angular acceleration to translational acceleration when there is slipping [closed]

This is the statement of the problem: Three identical cylinders with moments of inertia $I = βmR^2$ are situated in a triangle as shown in the figure. Find the initial downward acceleration of the ...
1
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4answers
148 views

Max turning velocity for a car as a function of centre of mass and axle width

Max turning velocity for a car as a function of centre of mass and axle width I'm trying to solve this problem. Show that a car is more likely to overturn going around a sharp corner if it has a ...
1
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2answers
545 views

Work done by Torque Due to Force

This is a homework problem I had that I couldn't quite figure out the reasoning behind. A force is applied to the rim of a disk that can rotate like a merry-go-round, so as to change its angular ...
1
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3answers
312 views

Equilibrium of a rigid body

Why is it necessary for a body to have the net torque acting on it be balanced along with the forces for it to be in equilibrium? Isn't torque just some special case of force like rotation is a ...
1
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1answer
286 views

Angular velocity - Gyroscope

I am currently researching the gyroscope on my own and i came across the concept of angular velocity. The torque ($T$) on a gyroscope is caused by $R\cdot F$, where the force i consider it to be ...
0
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1answer
39 views

Why astatic needles are immune to only terrestrial magnetic fields and not other magnetic fields?

This web article says: Astatic needles are basically two needles of approximately the same magnetic strength, mounted on top of one another. They are parallel, but their magnetic poles are on ...
0
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1answer
41 views

Understanding internal torques

I have having trouble with Q7: https://i.imgur.com/vsco1GW.png I don't understand how to find internal torque, the solutions say that the internal torque is equal to the external torque. So I can ...
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2answers
128 views

Purely mechanical question about torques in human body

Im trying to program an active ragdoll animation system for my game, and ive been stuck on this question for a while. Lets imagine a body falling backwards as shown on the scheme below. My question ...
3
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1answer
269 views

Torque about axis

There are two cases when force is acting on the square plate of side a in two different directions as shown in figure . In first case the force is acting perpendicular to the plane that is inside the ...
0
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3answers
46 views

Why is it easier to lever a mass about a point than it is to lift it vertically upwards?

My teacher told me that, by using moments, we can see how it takes half the force to lever an object up.
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1answer
200 views

Tension exerted by strings at corners of a rope grid [closed]

I am a software developer and helping someone with an art installation. It consists of a grid made of ropes. Grid is $12 \cdot 12$ meter and internal squares are $1 \cdot 1$ meter. Grid is suspended ...
2
votes
2answers
354 views

Why isn't gravity included in this calculation for torque?

In this textbook problem which was assigned for homework, I found a flaw in my understanding of torque. A $2.4\ \mathrm{kg}$ block rests on a slope and is attached by a string of negligible mass to ...
2
votes
3answers
195 views

If torque has a different value depending on the set origin, how can rotational kinetic energy be absolute?

I'm going to illustrate this confusion of mine in a thought experiment (poorly): Here we have origins for $\vec r_2, \vec r_1,$ and $\vec r_0$. What's undeniable is that this wheel is spinning in ...
0
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1answer
42 views

Spin of 2 oppositely charged fused point charges

If i fused 2 point particles (with opposite charges) together, would it be possible to change the magnitude of this object's spin by applying a torque on it? Also, if they are joined together, wouldn'...
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2answers
68 views

Finding the moment about a Point [closed]

I am having a difficult time understanding when to use cos or sin when finding the moment of a force about a point. I understand that moment is $\rm force\cdot distance$. I have attached a picture of ...
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1answer
311 views

Pulley system with gear - torque

I would like to ask, how can I calculate torque required for motor in this system if: input pulley is smaller one (number of teeth= z1) output is larger one (number of teeth= z2) with pinion (modul= ...
0
votes
1answer
26 views

Relating torque to the resulting angular momentum relative to the center of the wheel which is in an accelerated frame

I am attempting to answer the following thought experiment: A wheel rolls down a slope. The wheel is clearly not an inertial frame as it is accelerating. If friction is applying a torque ...
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1answer
37 views

Carrying the rod from the end VS from the middle? [closed]

How do I prove that if you carry this metal rod from R1 or R3 then, it takes more force(it feels heavier) in comparison to if you carry from R2? Weight of R1 = Weight of R2 = Weight of R3 Distance ...
0
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2answers
37 views

Does an object rotate around its COM when no torque is given? [duplicate]

Does an object rotate around its COM when no torque is given? For example if I were to throw a baseball bat in the air(I will hold it by the end of its shaft while I am throwing it and swing it ...