Final answer:
A hockey puck struck by a hockey stick experiences a change in momentum, as momentum is the product of mass and velocity, which changes when the puck is hit.
Step-by-step explanation:
When a hockey puck is struck by a hockey stick, it experiences a change in momentum. Momentum is the product of an object's mass and velocity, and since the puck is initially at rest, its momentum increases when it is hit by the stick. This change in momentum is due to the force exerted by the stick over the time of contact, which in physics is known as an impulse. Angular velocity and elastic potential energy are not relevant for a puck that is hit while lying flat and not undergoing rotation. Gravitational force remains constant as it is a field force dependent on mass and the distance from the Earth's center, which does not change significantly during the event.