Questions tagged [rotational-dynamics]
A tag for questions about the mechanical interactions of rotating objects, including torque and angular momentum.
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Anthropogenic relocation of Earth's mass
How much of Earth's mass would need to be relocated to cause catastrophic changes to its rotation or orbit, and how far would this mass need to be moved?
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How does an unbalanced spinning mass fly when released?
A solid mass is being spun about an axis A, but the center of mass C is offset somewhat from the center of spin A. The mass breaks free of the spin axis instantaneously. I believe that this results ...
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Instantaneous pole of rotation and angular velocity [closed]
I need to find what is (a) the angular velocity of the DC rod, (b) the velocity of point D, (c) the instantaneous pole of rotation of the DC rod, if the angular velocity of rod CB is $(3+i/10) rad/s$ (...
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Rotation in Spherical lens about its axis.....(made up of two materials) [closed]
I have encountered problems based on plane mirrors moving along with rotating at their axis, it was quite fun to do but when I think the same regarding the change in position of an image when the ...
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Do wind turbines spin at constant speed? If so, how? [closed]
All electrical power fed into the electric grid needs to be an AC power source at 60 Hz (in the U.S.) to within a very tight tolerance.
My understanding is that steam turbines are kept rotating at a ...
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The No Slip/Slip Condition for Rotating/Rotating and Translating Bodies
Consider a sphere of radius $r$ that is rolling on a rough surface, where its translational velocity $v$ is equal to $\omega r$, where $w$ is the angular velocity of its rotation. In this case, I ...
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How do I identify different accelerations on rotational rigid body dynamics?
So consider the image above (A cord passing over a pulley that is carrying a mass of $M_1$ at one end and wrapped around a cylinder of mass $M_2$ on a plane at the other end).
Apparently I was told ...
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Rotational Motion of a rod about an hinge, conservation of momentum [closed]
If a Rod is attached to a hinge of mass M and a ball of mass m
strikes the rod with a certain velocity and after that the rod will
start to rotate with an certain angular velocity. In this case The
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Is this Newtonian angular-momentum equation true? $P_x =$
Is this equation true (m is meters)?
$$ P_x = (L_z(\vec{O} + \hat{y} \mathrm{m}) - L_z(\vec{O}))/1 \mathrm{m}. $$
One way to derive the equation is this:
Given $n$ point particles with position $\vec{...
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Rotational Motion object rotating about its axis [closed]
if an object is rotating about its internal axis then why donot we take any force as centripetal force but we consider if it is rotating about an fixed axis outside the body then we consider ...
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Mechanics - circular motion of a mass with two ropes's tension [closed]
$L$, $l$ are the corresponding ropes length, $M$ is the tied body's mass and $ω$ is the angle's velocity s.t the mass $M$ is rotating around the axis of length $L$.
Assume gravitation force acts on ...
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Why is the work done by a force on a rigid body zero if the displacement of point of application of force is zero?
There have been previous questions asked similar to this question, but I couldn't understand the concept properly. Please help me get it.
There is a rod hinged at a point with no friction present on ...
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2D elastic collision between flat disk and rectangular block
I am trying to simulate the elastic collision between a disk and a rectangular body in 2D (like an ideal air hockey table). I have done the work already for disk-on-disk elastic collisions and ...
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Why a free rigid body applied with an external force rotates only about its center of mass and center of mass only translates? [duplicate]
Why a free rigid body at rest or going with constant velocity, when applied with an external force or after the application of an impulsive force, rotates only about its center of mass and the center ...
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Rolling without slipping and tangential accelereation of the contact point
Let's consider a wheel that rolls without slipping on a plane surface. I know that the rolling without slipping condition means that the velocity of the contact point of the wheel relative to the ...
