Question

Rolling a drum is work against friction. Why?

Answer 1

Answer:

It does rotational work. We can view this work as a medium between gravitational potential energy and rotational kinetic energy. So when it accelerates down the incline, friction force takes some of the gravitational potential energy and turns it into rotational kinetic energy for the cylinder.

Explanation:

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Answer 2

Explanation:

$\huge \tt \blue \: answer$

. It does rotational work. We can view this work as a medium between gravitational potential energy and rotational kinetic energy. So when it accelerates down the incline, friction force takes some of the gravitational potential energy and turns it into rotational kinetic energy for the cylinder.When the object is rolling and friction is acting on it, the point at which it acts is moving with respect to the ground frame, yet work done by friction in rolling is zero.A ball can slip on a surface, can roll, or both. A ball slipping on a surface is decelerated by the friction force opposing the ball linear displacement. The friction force provides also angular momentum to the ball, which starts rotating until it rolls on the surface without slipping.

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