Question

Strings are wound around two pucks identical in size. One string is around the pucks outer rim, while the other is around a smaller axle in the middle, as shown. A radius of the outer rim is twice that of an axle. A side view of the pucks is also included for clarity. You start pulling the pucks with the same force F at the same time, and the pucks are originally at rest. They slide on a frictionless surface. Moment of inertia of the top puck is twice that of the bottom puck. Side view After 5 seconds, which puck has a greater angular speed? The top puck. The bottom puck. It depends upon the their kinetic energy. O Need more information to decide. They have the same angular speed.

Answer 1

We know the effect of applied force on a rotational body acts like torque on that body.

And the torque causes the rotation. Troque T = r×F

Where r = distance of point of applied force and the center of rotation. Since for top puck the r has greater value so the torque will have also greater value.

Since rotational acceleration is directly proportional to the torque applied on the body. After5 seconds The top puck has a greater angular speed.