6 Answered Questions for the topic Rotational Dynamics

Rotational Dynamics Physics Forces Torque

08/03/19

Why is less force required to open a door when we apply a force at a greater distance from the hinge?
I know that the magnitude of a torque increases with the distance from the axis of rotation. What is the reason of that : how can a force exert a greater torque when the force is applied at a... more
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Rotational Dynamics Physics Forces Torque

07/31/19

Why does an unhinged body rotate about its centre of mass?
If a force is applied to a body which does not act through its centre of mass, it rotates about its centre of mass and not any other point. Why?
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Rotational Dynamics Physics Forces Torque

07/31/19

Torque direction meaning?
I apologize if this question is dumb, but I've looked all over for a straightforward answer and either I can't find one or the terms are too complex for me to understand. I have only a rudimentary... more
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Rotational Dynamics Physics Forces Friction

07/30/19

Why does a car engine not do work if the wheels don't slip?
I saw this mind boggling result that if the tires don't slip then the work done by an engine to move a car is zero. Why is this true? Moreover, what does this truly mean? **Update:** Sorry about... more
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Rotational Dynamics Physics Forces Kinematics

07/21/19

Has a body angular momentum and torque only in a circular path?
In different contexts, my book(**Principles of Physics** by Resnick, Halliday ,Walker) , they wrote > For torque, the path need no longer be a circle and we must write the torque as a vector... more
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Rotational Dynamics Physics Physics B Physics C

12/16/16

Final Angular Velocity. Need help w/ part 4
A phonograph turntable driven by an electric motor accelerates at a constant rate (i.e., constant angular acceleration) from 0 to 33.33 revolutions per minute in 2 minutes. The turntable is a... more
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