Assessment: Forces

A hockey puck slides on frictionless ice with no other horizontal forces acting. What happens to its velocity?

A rocket engine pushes exhaust gas downward. What is the third-law reaction force?

A net force of 36 N acts on an 8 kg cart. Find its acceleration.

Find the weight of a 12 kg mass on Earth (g = 9.8 m/s²).

A wooden block presses on a table with a normal force of 80 N. The coefficient of friction is 0.35. Find the maximum friction force.

Find the gravitational force between a 20 kg mass and a 100 kg mass, 5 m apart (G = 6.67 × 10⁻¹¹ N·m²/kg²).

A sled is pulled forward with 90 N while friction resists with 65 N. Find the resultant force.

A 0.15 kg baseball moving at 30 m/s is caught and brought to rest by a glove in 0.05 s. Find the size of the average force exerted by the glove.

A 0.2 kg stone and a 7 kg bowling ball are dropped simultaneously from the same height in a vacuum chamber (no air resistance). By what factor does the bowling ball's acceleration differ from the stone's? (Enter 1 if they are the same.)

A 2 kg trolley moving at 5 m/s collides with a stationary 3 kg trolley. After the collision, the 2 kg trolley bounces back at 1 m/s. Find the velocity of the 3 kg trolley after the collision.