Questions tagged [torque]

This tag is for questions regarding to torque, which is a measure of the increase in angular momentum over time.

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The forces acting on the tensegrity structure

Are these the only forces acting on the body. I assumed the COM to be somewhere there in between. since the tension in main string doesnt perfectly coincide with COM theres a small torque being ...
Zorua Chan's user avatar
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30 views

What is the physical significance of the cross product of curl of a vector field $v$ with another vector field $w$?

I think if curl of a vector field v corresponds to an applied rotation, it's cross product with a velocity vector field w (say) should give something analogous to the resulting torque. Am I close?
Benjamin Kurian's user avatar
20 votes
1 answer
1k views

If the tidal bulge on the earth speeds the moon up, how does the moon move to a higher orbit?

I understand that the moon causes a tidal bulge on Earth, and this tidal bulge moves slightly ahead of the moon due to Earth's rotation. When reading about why the moon is moving away from the Earth, ...
WillowRook's user avatar
-1 votes
0 answers
21 views

Why more torque when force is applied more distant from the pivot in an atomic view? [duplicate]

Why more torque when force is applied more distant from the pivot? I want an intuitive atomic view. I don't want mathematical formula torque= force* distance. Thanks.
Tough questions's user avatar
-1 votes
3 answers
73 views

Equation of Torque

The magnitude of torque is defined as the product of the perpendicular (to the object) component of the force I apply and the distance between the axis of rotation and the point of application of the ...
V T Naveen Mugundh's user avatar
0 votes
2 answers
50 views

Direction of the normal force [closed]

Suppose we have a bar with non-zero mass inside a hemispherical bucket fixed to the ground. Suppose, too, that there is friction between the bar and the inner spherical surface of the bucket. Part of ...
Rafael Ferreira's user avatar
1 vote
2 answers
95 views

Proof of Newton's second law of rotation for rigid body

I'm reading over my lectures notes on rigid body dynamics and I'm trying to prove as many results as possible. However I can't seem to prove that $\tau = \frac{dL}{dt}$ for a rigid body, where $\tau = ...
Charlélie Carer's user avatar
0 votes
1 answer
24 views

Abbreviations for energy and torque

What are correct abbreviations for torque and energy in US Customary and S.I. systems? Both include distance and force. Do we write N-m and lbf-ft for both torque and energy? I always heard (years ago)...
Bill's user avatar
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1 answer
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What is the formula for how a force affects linear motion on a rigid body?

Say a body (two glued spheres will do) hits a ceiling, and the balls and ceiling are the only things in the universe. I translate the point of impact to the center of mass, calculate my lever arms, ...
Jorge Al Najjar's user avatar
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0 answers
18 views

Picture frame hung by posts in restriction positions

Suppose you have a picture frame (or mirror) and it is held up by a string that goes around two posts which are at coordinates $(x_1, y_1)$ and $(x_2, y_2)$. The corners of the frame are at $(0,0)$ ...
ErikR's user avatar
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3 votes
0 answers
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Rotating a ball in space [closed]

If we have a ball in space and apply a force on its very edge, thus producing torque, it will start rotating, but will not move translationally. But, if that ball is resting on the ground and the ...
Malik Halilović's user avatar
3 votes
1 answer
49 views

Free Body Diagram of Precessing Top

Consider a heavy, symmetric top spinning on a table, initially inclined at some angle from the vertical. Assuming this angle is fixed, it follows that the weight $\textbf W$ and normal force $\textbf ...
William Deng's user avatar
17 votes
8 answers
7k views

Why is it possible to keep an object, say a book, horizontal while holding its corner?

When holding a book from its corner with two fingers in a pinched position, the fingers act as a sort of hinge, and the book is free to rotate about this corner only. The external forces acting on the ...
brainfreeze's user avatar
4 votes
2 answers
786 views

Like force, does the rotational effect of force/torque require some finite time to travel through a real body?

Let's say I am using a long wrench to unscrew a tight bolt because the formulas developed in rigid body statics states that the moment arm should be longer for minimal force application. But how long ...
NPon's user avatar
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Is there a way to explain torque and Euler's Laws of Motion from Newton's Laws

If I have a rigid rod and I apply a force $\vec F$ distance $r$ away from the centre of mass the torque on the rod is $\vec r \times \vec F$ from the centre of mass and the torque causes the rod to ...
244529's user avatar
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4 votes
4 answers
225 views

Weight and rate of movement

Im limited on my physics knowledge and sometimes can't understand simple laws. When i have two 5kg objects on a "manual weight scale" then forces are equal and the scale stays in place. ...
wtknow's user avatar
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How can Torque and Work have the same dimensions (both can be expressed in N.m because Joules = m.N = N.m) but they represent diffrent quantitie?

So torque and work are both distance times force but how can they be so different conceptually? I understand the torque is an outer product and is a vector while work is a dot product and is a scalar ...
Mahran Yousef's user avatar
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2 answers
39 views

How many components does the net force have on a rotating object?

I understand that there is the radial and tangential force components acting on a spinning object, but according to the attached image from my book, there is a third component F_1z that is ...
Am001's user avatar
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0 votes
1 answer
121 views

What are the physics behind the torque trick that uses a single match to hold a water bottle?

https://youtu.be/CO5YUrbFTig?si=6HBL6tsSZqS6EWkq I have seen a lot of videos about the same physics trick lately. How would I be able to do this trick myself and find out what forces are interacting ...
zoe's user avatar
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0 votes
3 answers
94 views

Convention or reality?

In case of a disc rotating about an axis perpendicular to its plane passing through its centre of mass, the torque vector points up or down depending upon direction of rotation. Is it just convention, ...
Dumb person 's user avatar
0 votes
3 answers
138 views

Confused with the effects of moment of inertia and torque

According to the definition of torque, if the distance from the pivot is large the force required to apply will be smaller to move with the specified angular velocity/acceleration. And we can ...
ayyappan muthukrishnan's user avatar
0 votes
1 answer
66 views

Torque of a lever with two fixed points at an acute angle

Is the torque at the yellow fixed point calculated using the perpendicular distance between the yellow fixed point and the red weight, or using the distance between the yellow fixed point and the blue ...
Glen's user avatar
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0 votes
1 answer
53 views

Can we model the pitch up of an aircraft due to sudden application of brakes while it is rolling down an inclined using angular impulse method? [closed]

Consider an aircraft parked on an inclined plane. Due to a mistake by the pilot the brakes were released, and the wheel chocks were missing. When the plane started to roll down, the pilot applied the ...
The Protagonist's user avatar
0 votes
1 answer
53 views

Can someone please elaborate an answer about torque? [duplicate]

Please explain Michael Seifert's answer here I think $x,y$ are distances but what is $d$? How did he get this formula? x cos ⁡ θ + d sin ⁡ θ Does this ...
ChemistryLearner's user avatar
1 vote
2 answers
72 views

Normal reaction exerted by a rolling object

If we take a disc of mass M and radius R and assume that the disc is performing Combined rotational and translational motion on a frictionless flat surface. then if we take a point at the top of the ...
Srivas's user avatar
  • 25
0 votes
3 answers
106 views

Why does torque increase with radius or distance from the centre?

Why is it that making a perpendicular force farther away from the axis of rotation increases the rate of change of angular momentum (hence, torque)?
Varshil MVH Pets's user avatar
0 votes
1 answer
111 views

Maximum Velocity of Car in Circular Motion Without Tipping?

We are tasked with finding the maximum velocity of a 4-wheeled vehicle undergoing circular motion without tipping (assuming that the force of gravity will act at the car's center of mass and the the ...
naebkcaj's user avatar
0 votes
1 answer
72 views

Why is the output torque less than the input force of 20N applied from a wrench having length of 0.8m?

A wrench is of length 0.8m, or any number below 1.0m, I am exerting a force of 20 Newtons on the point A (one end of the wrench), on point B there is a bolt (on other end). If I calculate the Torque ...
Newbee's user avatar
  • 3
1 vote
2 answers
146 views

Calculate rotation from net torque and inertia matrix

I am trying to grasp the concepts of forces applied to a rigid body resulting in a net change of the rotation of the object. This is not a home assignment and I read some resources on both the web and ...
Decaf Sux's user avatar
  • 113
1 vote
2 answers
176 views

Is Joule equivalent to Joule/radian? [duplicate]

The work a constant torque does when it moves a particle through an angel $\theta$ is given by $\tau \theta$. The work is measured in Joule, so the torque should be measured Joule/radian, but the ...
Jack's user avatar
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0 answers
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Equations for Torque Capacity and Bolt Clamping

I am doing research into how I can best approximate the torque capacity of several components bolted together in an assembly and specifically when a pattern of bolts is holding several parts together ...
SoloLeveling's user avatar
0 votes
0 answers
46 views

Problem while calculing the bending torque of internal air pressure in a soft actuator

this is a question I cant resolve while looking a paper I needed for my undergraduate thesis. In this image (from Modeling of Soft Fiber-Reinforced Bending Actuators, Panagiotis Polygerinos et al.), ...
Trying_to_improve's user avatar
0 votes
2 answers
61 views

Can the brakes of a Semi-trailer truck overcome the torque of the engine? [closed]

On the average Semi-trailer truck, assuming an average load, can the engine overcome the brakes and continue spinning the wheels despite the operator applying the brakes fully? This would be assuming ...
nabeelr's user avatar
  • 101
0 votes
0 answers
13 views

Torque profile with fixed boundary condition

I am trying to find a simple treatment of elasticity theory of a scenario where I have a thin rod attached to a disc (radius $r_0$), and the disc is held fixed at its edge. Now I apply some torque to ...
Faser's user avatar
  • 703
0 votes
1 answer
45 views

Rotational Equilibrium With Forces acting on only two points

Imagine a rod that is held at angle to the vertical by some hook. The rod is in equilibrium. There would be three forces on this rod - Normal contact, Friction, and the weight of the rod. I struggle ...
john's user avatar
  • 548
0 votes
2 answers
74 views

Misconception About Torque Log cutting example

LOG CUTTING "Three friends go camping in the forest with their families. They start collecting wood to make a fire. They find a large, branchless log in the forest. One end of the log is very ...
AliceX's user avatar
  • 73
1 vote
3 answers
62 views

Sign of distance/arm when finding moment/torque

I know that $M=Fd$, but when I have a negative moment, does the sign of the moment matter when I'm calculating for distance? If yes, then what would it mean when distance is negative?
user16629503's user avatar
0 votes
2 answers
65 views

What causes an arrow to rotate? [duplicate]

My intuition: In a system without air resistance, I would expect an arrow shot at an angle with its head pointing upwards to follow a ballistic trajectory without rotating around the horizon - because ...
shaiko's user avatar
  • 411
0 votes
0 answers
53 views

Calculate weight distribution on 2D plane

I am trying to figure out how I can have a formula for the weight distribution on a square. But let me just describe what I am doing, We have the classical horizontal beam support problem And I we can ...
Ken Adams's user avatar
3 votes
1 answer
275 views

What exerts torque on a pulsar? [duplicate]

I'm modeling a pulsar as a rotating compact body with frequency $\omega(t)$, and magnetic dipole moment misaligned from the axis of rotation by angle $\chi$. It's straightforward to calculate the ...
Aiden's user avatar
  • 1,661
0 votes
1 answer
55 views

Is Torque always defined about the axis of rotation?

My professor told me torque can be calculated about any point in space, but would such a torque ever make sense even if the particle is rotating about some other axis, on which the point does not lie?
Haria Kumar's user avatar
0 votes
1 answer
54 views

Choice of axis in analysis of gyroscopic precession

In many demonstrations of analysis of gyroscopic precession, the analysis goes on by choosing two axes, one about which angular momentum is calculated, another about which torque of gravity is ...
Eisenstein's user avatar
2 votes
2 answers
64 views

Confusion about torque [duplicate]

Consider a free body, not hinged about any point. If a force is applied to one end of the body, the body has a net nonzero torque about many points in space. About which will it rotate? Am I wrong in ...
Eisenstein's user avatar
3 votes
1 answer
173 views

What does the geometric product between displacement (or maybe position) and force vectors mean?

So work is measured in joules, which is newton * meter, and it is calculated by taking a scalar product between displacement and force vectors. And torque is very similar, it is newton * meter too, ...
Богдан Красновид's user avatar
0 votes
1 answer
47 views

How to calculate total moment around $z$-axis when the armlengths are not the same for all motors on a hexacopter?

I wonder how I can calculate the total moment around $z$-axis at a given rotational velocity for the motors on a hexacopter. My intuition tells me that motors that are more distant to center of mass ...
trxrg's user avatar
  • 151
1 vote
2 answers
194 views

Axis of rotation of a spool unwinding and falling under gravity

There is a problem that asks for forces that apply torque around the axis of rotation on a spool of string that falls and unwinds under gravity. The spool falls straight down with a vertical string. ...
Mirae's user avatar
  • 69
0 votes
0 answers
33 views

Interpret momentum applied on a rod when holding it from one end

Yesterday I started wondering exactly how much more effort it takes holding a rod from one of it's edged instead of from it's centre. Picture a rod, held by your hand from under it's centre. The force ...
El Nitromante's user avatar
0 votes
2 answers
84 views

Why does force decrease with increase in velocity in case power was constant?

Suppose an internal combustion engine burns the same amount of fuel every cycle (regardless of engine or car speed ) that means it creates the same pressure every cycle and the force on the piston due ...
John greg's user avatar
2 votes
2 answers
94 views

How does a magnetic field do work on rotating a current loop?

Lorentz force tells us that the force on a charged particle by a magnetic field is always perpendicular to its velocity. So its a pretty well known fact that a magnetic field doesn't do work. But we ...
afrin's user avatar
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0 votes
0 answers
21 views

Why does the period of precession of a gyroscope have to be way larger than it's spin period so that it's motion can be modelled?

Mathematically, torque induced gyroscopic precession may be modelled with the following equation: $$ {\displaystyle T_{\mathrm {p} }={\frac {4\pi ^{2}I_{\mathrm {s} }}{\ mgrT_{\mathrm {s} }}}={\frac {...
ThincThru's user avatar

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