Momentum changes for each of these scenarios except for
A) a falling rock from an instant after initial drop from a high tower until an instant before impact.
B) a movie stunt performer flying on a parabolic path before the performer stops on the ground.
C) a rocket sled on a horizontal track from an instant after the drag parachute opens until an instant before the sled comes to rest.
D) a block sliding at constant speed (with friction) down an inclined plane.
E) a neutron in a nuclear reactor that changes the direction but not the magnitude of its velocity when it scatters off another neutron.

Question

Quizplus · Accepted Answer

In scenario D, a block sliding at constant speed down an inclined plane implies that there is no acceleration (since speed is constant), and thus no change in momentum. In all other scenarios, there is either a change in speed or direction, indicating a change in momentum.

Momentum Changes for Each of These Scenarios Except for