Which of the following statements is the one that is correct?
A)If all the forces on a body act through the axis of rotation,the angular acceleration will be zero.
B)If two bodies have the same moment of inertia about their centers of mass and the same mass,they must be identical.
C)Two disks roll down an inclined plane without slipping.The one with a smaller radius will always reach the bottom first independent of their masses.
D)Two disks roll down an inclined plane without slipping.The one with a bigger radius will always reach the bottom first independent of their masses.
E)Two disks roll down an inclined plane without slipping.The one with a bigger mass will always reach the bottom first.

Question

Quizplus · Accepted Answer

The statement in option A is correct according to the principle of rotational dynamics which states that if the net torque on a body is zero, its angular acceleration will be zero. When all the forces on a body act through its axis of rotation, the net torque acting on the body is zero. Thus, the angular acceleration will be zero in such a situation.

Which of the Following Statements Is the One That Is