A block attached to an ideal spring on a frictionless horizontal surface is pulled to…
PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
A block attached to an ideal spring on a frictionless horizontal surface is pulled to the right of its equilibrium position by 4 cm and released from rest. At this instant, which one of the following statements about the force on the block is correct?
(a) The force is directed to the right and its magnitude is proportional to 4cm.
(b) The force is zero because the block is momentarily at rest.
(c) The force is directed to the left and its magnitude is proportional to (4cm)2.
(d) The force is directed to the left and its magnitude is proportional to 4cm.