A. Forces that cause an object to speed up

B. Forces that combine to produce a net force of zero

C. Forces acting in the same direction

D. Forces that always make an object move

A. It stays still

B. It moves left

C. It moves right

D. It jumps upward

A. Stop unless friction is removed

B. Continue moving unless acted on by an unbalanced force

C. Always speed up

D. Move in circles

A. The books are heavy

B. Gravity pulls down while the table pushes up

C. The table is flat

D. The books have inertia

A. The skier speeds up

B. The skier slows down

C. The skier moves at a constant velocity

D. The skier does not move

A. A ball rolling at constant speed

B. A chair sitting still

C. A rocket launching upward

D. A pencil lying on a table