A block slides across a horizontal table at constant speed while being pushed horizontally
PHYSICS · Single correct · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion
Problem
A block slides across a horizontal table at constant speed while being pushed horizontally. Which statement about the horizontal pushing force F and the kinetic friction force Ff,k is correct?
(a) F is greater than Ff,k because a continuous net forward force is required to keep the block moving at constant speed.
(b) F depends on the surface area of contact, whereas Ff,k does not.
(c) F equals Ff,k in magnitude and is opposite in direction.
(d) F is less than Ff,k because kinetic friction grows with the speed of the block.