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Are torque exsiting at every rotational motion?

how about free fall or wheel rotating without any force act on it??

Question:

A 0.8m diameter, 50kg flywheel with a radius of gyration of 0.283m must be braked from 60 rpm to rest in 2s. calculate the tangential force required to accomplish this braking action.

angular acceralation = -3.142rad/s sq

I = 4.004kgm sq

torque equation on ratational motion of the flywheel is :

Torque- ( T x 0.4m ) = I x (angular acceleration) < T is tangential force >

0- ( T x 0.4 ) = 4.004 ( -3.142 )

-0.4T = -12.58

T = 31.4 N

why thetorquehere is equal tozero??

anyone can help and explain...

ur reply is greatly appreciated... thankzzz

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# Every rotational motion have torque?

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