Question

Is torque about a point in rigid body equal to the torque of that whole body ?
If not than why we equate I(alpha) = F×r

Answer 1

Answer:

TORQUE

Explanation:

» We get this equation from Derivation of Angular Momentum ( L ).

» we know that ;

RATE OF CHANGE OF ANGULAR MOMENTUM ( L ) = NET TORQUE ON BODY.

★L = I × W ( Angular Velocity )

» dL / dt = I ( constant ) × dW / dt

» dL / dt = I × â ( Angular Acceleration ) = Torque

[ Torque = I × â ( alpha ) ]

★ Hence Proved

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Answer 2

TORQUE

Torque is the measure of the force that can cause an object to rotate about an axis. ... Hence, torque can be defined as the rotational equivalent of linear force. The point where the object rotates is called the axis of rotation. In physics, torque is simply the tendency of a force to turn or twist.