Conservation of Momentum

The backward recoil speed of a rifle is much less than the forward speed of a bullet because they have very different masses. The rifle has _?_.

• less momentum than the bullet

• more momentum than the bullet

• the same momentum as the bullet

The Law of Conservation of Momentum is closely linked to _?_.

• Newton’s first law of inertia

• Newton’s second law of force, mass and acceleration

• Newton’s third law action-reaction forces

• the law of conservation of energy

Once released and moving, the first student will have momentum. What will happen to that momentum when they collide with the second student?

• The momentum will transfer to the second student.

• The momentum would be destroyed.

• The momentum of the system would be cut in half.

• The momentum of the system would be doubled.

The rocket pushes down on the exhaust gases as the exhaust gases push up on the rocket, causing the rocket to accelerate upward. Which has the most momentum, the exhaust gases or the rocket?

• they have the same momentum

• the rocket

• the exhaust gases

• neither has any momentum

The Law of Conservation of Momentum states:

• The total momentum of a system before a collision is equal to the total momentum after a collision.

• The total momentum of a system before a collision is greater than the total momentum after a collision.

• The total momentum of a system before a collision is less than the total momentum after a collision.

• The total momentum of a system before a collision is not related to the total momentum after a collision.

According to Newton's 3rd Law, for every action force there is an _?_.

• equal and opposite reaction force

• equal and parallel reaction force

• unequal and opposite reaction force

• unequal and unrelated reaction force

Pick all of the scenarios below that involve collisions (objects coming together).

• A catcher catches a baseball.

• A pitcher throws a baseball.

• Two cars smash into each other.

• Two students on roller skates push away from each other.

• A bug smashes into a windshield.

Pick all of the scenarios that are explosions (objects separating).

• A cannon fires a cannon ball.

• A spoon is shoved into a jar of peanut butter.

• A linebacker tackles a member of the opposite team.

• A swimmer jumps off a floating raft.

• A figure skater throws a heavy ball.

If the four fish make up an isolated system, what would be true about the momentum of the large fish once it is the only remaining fish?

• the large fish would have a greater momentum than all four fish combined after eating the other fish

• the final momentum of the large fish would be equal to the total initial momentum of all four fish

• the large fish would have less momentum after eating the other fish

A person on a stationary skateboard throws a bowling ball. The ball moves left and the person rolls right as a result. The ball has a speed of 5 m/s. What would be a possible speed for the person after the throw?

• 0 m/s

• 1.5 m/s

• 5.0 m/s

• 7.5 m/s