Q. A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle θ. The frictional force :
A) converts translational energy to rotational energy
B) dissipates energy as heat
C) decreases the rotational motion
D) decreases the rotational and translational motion
Explanation
[Solution from source] In rolling without slipping the contact point is momentarily at rest, so static friction does no work and dissipates no heat. Its torque speeds up the rotation while it slows the translation, so it converts translational energy into rotational energy. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.