All Questions
Tagged with torque classical-mechanics
196
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Does A Pivot Exert A Force
On a frictionless horizontal table, a uniform stick is pivoted at its middle, and a ball collides elastically with one end, as shown in Fig. 8.10. During the collision, what are all the quantities ...
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Determining Equivalent Point Forces for a Rigid Body Given Net Force and Torque [closed]
Consider a rigid planar body subject to a force field, such as the gravitational interaction between polygons in a 3D space described in this question.
Given:
The net force acting on the rigid body
...
- 382
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Can a translational torque cause a change in rotational angular momentum? gyroscope example
Please confirm if my understanding is correct: The example of a gyroscope suspended from a pivot is a case in which translational torque causes a change in the direction of rotational angular momentum:...
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Spinning plate on the barbell
Suppose I have a plate and a barbell like the ones we see in the gym. When I spin the plat in the clockwise direction, the barbell also starts spinning in the clockwise direction. When I put my hand ...
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In equation of torque and angular momentum what is the position vector exactly
In terms of vectors:
$$
L = r \times p
$$
and torque:
$$
T = r \times F
$$
In both these cases what exactly does the $r$ vector represent? Is it vector from origin of axis or center of mass? How would ...
- 35
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2
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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 ...
- 113
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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.), ...
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2
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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 ...
- 428
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Prove that the derivative of the relativistic angular momentum is the relativistic torque
In the book "relativity" by Vincenzo Barone, the relativistic angular momentum tensor is defined as:
$L^{ij}= x^ip^j - x^jp^i$
(With the indexes $i,j$ going from 0 to 3)
And the relativistic ...
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How much should the disk/wheel spin for gyroscopic-precession to take place? Is there a threshold?
Suppose we have a spinning gyroscope whose disk is of mass $m$, spinning at angular velocity $\omega$, and attached to a rod of length $r$.
The precession of the gyroscope around the $z$-axis will be ...
- 8,640
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Apparent paradox in taking torque about a translating axis
Consider a horizontal long rod that is undergoing free fall. Consider the torque about an axis through the rod (perpendicular to the rod and to the direction of gravitational force), that is a little ...
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Relating Torque conceptually
So hypothetically, you have a disc or ring. And on opposing edges of that disc/ring, there are two thrusters that given a set amount of Newtons of force (say 120 N) both in the counterclockwise ...
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5
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160
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Torque Intuition [duplicate]
We are all taught that the torque $\boldsymbol{\tau}$ is given by $\boldsymbol{\tau} = \mathbf{r}\times\mathbf{F}$ so that torque increases with the lever arm length. What is the physical intuition ...
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3
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When is the equation $\vec{L}=I\vec{\omega}$ not valid?
When is the equation $\vec{L}=I\vec{\omega}$ not valid?
Let me clarify, I've encountered a few problems where the angular momentum you obtained by integrating and the angular momentum you'd obtain by ...
user348222
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Mechanical power during rotational motion and torque: the physical meaning of their time derivatives
It is known that the mechanical power during rotational motion is defined as:
$P = M \cdot \dot{\theta}$
where $M$ is torque ($N \cdot m$) and $\dot{\theta}$ is angular velocity ($rad/s$).
If we ...
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