PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A block hangs at rest from a vertical spring. The spring is then slowly pulled downward an additional 5cm and held there without allowing the block to accelerate. Which statement best describes the forces acting on the block while it is held at the new position?
(a) The upward spring force equals the block’s weight.
(b) The upward spring force is less than the block’s weight.
(c) The upward spring force is greater than the block’s weight.
(d) The relationship between the upward spring force and the block’s weight cannot be determined without knowing the spring constant.