A wheel is rotating clockwise when a braking pad presses against its rim and exerts a…
PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A wheel is rotating clockwise when a braking pad presses against its rim and exerts a constant torque opposite to the wheel’s motion until the wheel comes to rest after turning through 2.0rad. Which statement best describes the work done during this interval?
(a) The braking pad does zero work on the wheel because the point of contact is instantaneously at rest relative to the pad.
(b) The braking pad does negative work on the wheel, and the wheel does positive work on the pad.
(c) The braking pad and the wheel both do negative work on each other.
(d) The braking torque does zero work because the wheel’s final angular velocity is zero.