Which of the following conditions guarantees that a stationary block on a horizontal…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Which of the following conditions guarantees that a stationary block on a horizontal surface will remain at rest?
(a) Any applied horizontal force is smaller than the coefficient of kinetic friction times the normal force.
(b) The vector sum of all horizontal forces acting on the block is zero.
(c) The upward normal force exerted by the surface equals the block’s weight mg.
(d) Any single applied horizontal force is smaller than the coefficient of static friction times the normal force.