Momentum and Collisions Quiz

What is the main principle used to predict outcomes in collision problems?

• Conservation of energy

• Law of universal gravitation

• Conservation of momentum

• Newton's first law

In an elastic collision, what happens to the two objects after they collide?

• They stop moving

• They stick together

• They bounce off each other

• They explode into smaller pieces

If a 5 kg ball moving to the right at 10 m/s collides with a 3 kg ball moving to the left at 6 m/s, what is the velocity of the 3 kg ball after the collision if the 5 kg ball moves to the left at 2 m/s?

• 6 m/s to the right

• 8 m/s to the left

• 14 m/s to the right

• 10 m/s to the left

What happens to an object in an elastic collision when it hits a wall?

• It moves along the wall

• It bounces back with the same speed

• It sticks to the wall

• It stops moving

In an inelastic collision, how do the objects behave after colliding?

• They stop moving

• They move together as one object

• They explode into smaller pieces

• They bounce off each other

A 70 kg football player moving right at 10 m/s collides with a 60 kg player moving left at 8 m/s. What is their velocity after they collide and move together?

• 3.5 m/s to the left

• 1.7 m/s to the right

• 5 m/s to the right

• 0 m/s

What is the initial total momentum of a system where a 50 kg astronaut and a 5 kg hammer are both at rest?

• 0 kg m/s

• 55 kg m/s

• 5 kg m/s

• 50 kg m/s

If a skateboarder throws a 5 kg brick to the left at 5 m/s and rolls away at 5 m/s, what is the mass of the skateboarder?

• 100 kg

• 75 kg

• 50 kg

• 25 kg

In a two-dimensional collision, what remains conserved along each axis?

• Momentum

• Mass

• Velocity

• Energy

What is the total velocity of a 3 kg ball after a two-dimensional collision if its x and y components are 5.12 m/s and 6.67 m/s, respectively?

• 6 m/s

• 10 m/s

• 7.5 m/s

• 8.41 m/s