Questions tagged [torque]

This tag is for questions regarding to Torque which is a measure of the force that can cause an object to rotate about an axis.

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31 views

Why intuitively do we define the turning effect of a force as force X perpendicular distance?

The formula for moment about a point is: $$M = Fd$$ After looking at other answers on stackexchange, I'm still not convinced with the 'intuitive' explanations that are given. I understand the cross ...
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Which is the part that's work applied at and rotates with a distance? [closed]

For the figure below I have a question that is: I see that the pink rod is the shaft and a gray circular body. What I can't get is that which one is the work being applied at and for which one does ($...
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What's the meaning of unit of moment $\mathrm{N\cdot m}$? How do you explain it? [duplicate]

I know the meaning of units with division like $\mathrm{m/s}$ or $\mathrm{m/s^2}$ etc. they make sense, like $2\ \mathrm{m/s}$ is like the car pass $2\ \mathrm m$ in $1$ second, you know what I mean? ...
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Figure how much torque/force to apply for a joint

Let's say I have a rod (with mass), that is connected loosely (like a swing) to a stationary axis. I would like to know how much torque I would need to add to cause the rod to point toward a target (...
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3answers
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Is $d\theta$ a vector and does the equation $d\vec{s}=d\theta \times \vec{r}$ make sense?

I was reading about torque on Wikipedia and I found this passage (in the section "Relationship between torque, power, and energy") The work done by a variable force acting over a finite ...
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In its free body diagram, there are only horizontal resistive forces. How can a car accelerate forward?

I am wondering why a car can accelerate forward even if no forward net force acting on it. See the following diagram. I don't draw the internal forces due to engine because they don't contribute to ...
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When a force acts on an extended object how much of the force goes into linear motion vs rotational motion?

So basically my question is when a force acts on a rigid body I know that the part of the force perpendicular to the rotation axis of the object causes a torque and therefore a rotation (If it is the ...
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1answer
39 views

Why would a perfectly incompressible ball on a rough surface stop rolling?

We know that the force that opposes the rolling of an object exists due to the deformation of the body's surface at the point of contact which creates a decelerating torque on the body. What if the ...
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What is the normal force below a bloc on a tilted plane

Suppose there's a solid regular rectangular bloc of mass $m$ standing still on a tilted plane (inclination angle $\theta$). There are three forces acting on the bloc : its weight $P = m g$, the ...
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Who would touch the ground of a see saw first?

Imagine 2 perfectly balanced sea saws. A heavy person sits on one side of the seasaw. A light person sits on one side of the other seasaw. If they both saw down at the same time, which seasaw would ...
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Trying to find Potential Energy Equation

I am trying to define a potential energy equation wrt h where when h=0, the potential energy is 0. We are given radius=R, width=W, mass=M, and the number of loops of the wire across the diameter is N. ...
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Torque of upside-down T-shape

I want to calculate the minimum force $F$ required to tip the above shape about the pivot point (orange dot). Assume the mass of the vertical portion is negligible compared to the base. Assume that ...
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6answers
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Intuition behind torque, rotational inertia and angular momentum

I'm reading about conservation of linear momentum and angular momentum. I understand the idea that angular momentum should be thought of as the "rotational analogue" of linear momentum, just ...
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Is this formula for finding the balancing point correct?

Suppose I have a uniform meter rule in which there are a number of weights $w_1,w_2,w_3,....,w_n$ suspended at points $p_1,p_2,....,p_n$,respectively and the meter rule itself has a weight $w$ that ...
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Distribution of Weight

Say, in 2 dimensions, that we have a rectangular mass resting on two legs. Then each leg supports half its weight. Now, say one of those legs is instead a string hanging from the ceiling. How is ...
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Reaction torque of angled nutrunner

I have a question regarding the behavior of an right-angled, air/electrical powered nutrunner. More specifically, the reaction torque that the operator is subject to during operation. When the ...
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1answer
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For weighted pull ups, how does positioning the weight below the hips (eg a dip belt) make the motion harder than when placed on the back (eg a bag)?)

I have been doing pull-ups for a while and decided to recently transition into weighted pull-ups for more growth. When gathering advice, I discovered that placing a weight between the legs, with the ...
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What is the axis about which we calculate torque in a loop due to magnetic field?

I've learnt that Torque is calculated about an axis, but what is the axis about which we calculate the Torque due magnetic field in a current carrying loop?
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Formula to convert vertical force into horizontal force to determine the needed torque of a motor? [closed]

I am a very uneducated individual with maybe 3rd grade level math skills. Say I want to build a rotating camera mount and I need to specify the proper torque/motor to accomplish the task. How would I ...
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1answer
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Force (linear and rotation) field between two magnets [closed]

Say I have the magnetic field of two magnets $S_1$ and $S_2$ as well as their respective magnetic moments. Each of their field strengths is modeled by a series of vortexes on a 2d plane. What is the ...
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1answer
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Simple Harmonic Motion of square/rectangular lamina and discs/rings about an axis parallel to the plane of object passing through centre of it

I can't understand why if we tilt any describe object above(say given in picture about x/y axis) we observe Simple Harmonic Motion (SHM) of that body about it. It should not possible as, when we tilt ...
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Maximum length climbed by a squirrel on a vertical rod [closed]

A squirrel of mass $m$ climbs slowly on a thin straight vertical rod of length $L$. Mass of the rod is negligible as compared to that of the squirrel and size of the squirrel is negligible as compared ...
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6answers
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Why does a rolling sphere slow down if work done by friction on it is zero?

When we push a sphere on a rough horizontal surface, it slows down because there is a net torque on it (by normal force and friction acting in opposite directions) and this causes its angular speed to ...
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4answers
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Car A has higher power, but car B has higher torque. Which one would win in a straight drag race? [closed]

Suppose we have 2 cars with different specifications. Car A has a higher power specification but a lower torque specification. Car B has a higher torque specification but a lower power specification....
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485 views

Why do steam engines produce maximum torque at 0 rpm, unlike internal combustion engines which have minimum torque at 0 rpm?

Just as it says in the title , the title is self explanatory. Can anyone explain the reason for that ?
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How does a current carrying loop in a uniform magnetic field $\vec{B}$ behave?

The torque on the loop about any axis parallel to the plane of the loop is $\vec\tau = \vec\mu \ \times \vec B$. If this is true about any axis, then how would such a loop actually behave in a ...
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1answer
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Torque and angular acceleration in rotating frames

If we are using the equation $\tau=I\cdot \alpha$ (where $\tau$ is the torque, $I$ is the moment of inertia, $\alpha$ is the angular acceleration) in a rotating frame of reference, we have to account ...
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Intuitive derivation for the precession rate of a spinning wheel

The derivation of the precession rate of a wheel hanging from a rope, as shown below usually involves taking the total torque acting on the system and equating it to the change in angular momentum. ...
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Distribution of normal force of a lever system [closed]

So from the diagram, there is a rigid solid subjected to a downward applied point force on its rightmost end, and a fixed pivot on its leftmost end. The rigid solid A is in contact with an elastic ...
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Torques acting on a unicyclist

When a unicyclist rounds a bend, he or she has to tilt in order to generate a frictional force, the friction acting as the centripetal force constraining the unicyclist to a circular path. However, ...
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1answer
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Derivation of precession rate of a wheel gyroscope [closed]

I searched on the web and all I could find is the precession rate of a spinning top. But what I want is the derivation of the precession rate of a wheel hanging from a rope, as shown below: which is ...
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1answer
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A hard attempt to compare liquid and solid with Newtonian mechanics

Suppose there is a wooden hemisphere on a horizontal plane, apex touching the plane. A small wooden cube is slowly placed on the base of the hemisphere anywhere other than the centre. As a result of ...
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1answer
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How do you calculate the linear and rotational motion caused by an asymmetrical force?

Take the following situation, ignoring friction. I apply a force to one side of the square object. Does it begin to both rotate AND move linearly in the direction of the Force? If so, does the force ...
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4answers
49 views

An application of Torque

When we press an end of a stick/rod against a wall (rough enough to ensure that friction balances the weight) what happens is that owing to friction the point of normal force shifts to prevent ...
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Motorcycle multi-body model and internal torques

In deriving a model for the in-plane dynamics of a motorcycle and I am facing the problem of reactive torques. The model is a multi-body system, where the bodies of interest are rear wheel, swingarm ...
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1answer
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Why is torque assumed to be constant?

Consider a spanner: I was doing calculations on how much torque would be applied on the bolt. To do this, I considered how much force was being applied at the full length of the handle. Then, I ...
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1answer
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Rotation of a rigid body - Simple Inverted Pendulum

I was thinking about a really simple inverted pendulum of length $L$, mass $M$ and made this free-body diagram: I decided to apply Newton's second law relative to the origin (pivot) and to the ...
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1answer
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How can I relate torque with the tangential component of force times the radius?

In the book, Feynman lectures (Part 1, Section 18; 18–2: Rotation of a rigid body), the author says: $$∆W = (xF_y− yF_x)\Delta\theta$$ where $xF_y−yF_x$ is torque. He also says: Now let us consider a ...
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Why do we say "pound feet of torque" when stating torque?

This is kind of a grammar question, but when stating a measurement, like distance, force, time, or volume, we generally say 5 gallons, 50 lbs, or 10 miles etc. It is understood we are talking about ...
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How much weight $w$ is needed to keep the lever balanced? [closed]

Imagine here's a strange lever on the right side, there's weight $W$ sitting on an arm with the length $L$ on the left side, there's the L shape thing attached to the end, marked as blue in the ...
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1answer
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Is friction what results in rolling without slipping?

I read the following scenario about a yo-yo: The translational and rotational forms of Newton’s second law for this yo-yo is $Mg - T=Ma_y$ and $TR_0=I\alpha_z$, respectively. It was also said that &...
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Rotating a rolling-without-slipping wheel in the direction that makes the contacting point having doubled velocity as opposed to a velocity of 0

The following picture illustrates the situation of rolling without slipping. I noticed that this is achieved as the direction of $v_{cm}$ is the opposite of $\omega R$, at where the wheel is in ...
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3answers
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Using gyroscopes to turn airplanes

Could multiple gyroscopes be used to change direction in a flying vehicle? Im a physics noob and don't really know what else to add... If having one gyroscope allows you to change your direction in 90°...
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Torque from drag force

A diver (assumed to be a rigid body) leaping off the springboard experiences no external torque from gravity since gravity acts at the COM. Air resistance doesn't act on every particle of the diver so ...
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Can we set an object into both translational and rotational motion with only 1 force

It is said in my textbook that to set a puck into both translational and rotational motion, we can simultaneously push the puck (with any linear velocity) and rotate it (with any angular velocity). I ...
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The meaning of "being mounted in horizontal frictionless bearings"

In the following scenario: In an Atwood's machine, there are 2 blocks. The pulley is mounted in horizontal frictionless bearings. When released from rest, the heavier block is observed to fall $x$m ...
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F1 car spin direction when losing traction

In this video at 0:19, the car on the right drifts too far onto the grass and ends up sliding to the left/anti-clockwise from top view. My initial instinct before the spin would be that car would spin ...
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Consider particle interactions in the string, why are tensions in the pulley different when the pulley has a mass or moment of inertia?

From answers to the following question Why are tensions in the pulley different when the pulley has a mass or moment of inertia?, I understand that the reason for that is because the difference in ...
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Why don't things rotate when they fall?

One of the answers to this question: How does the center of gravity work? said the follows: Since we can see that things do not start to rotate when they fall, we must assume gravity when averaged ...
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A comparative study between individual blocks to one long block

In relation to two previous discussions about Newtonian mechanics first asked by esdoublef Free body diagram on a rack of wooden blocks and afterwards silverrahul, Horizontal Rack of blocks revisited ...

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