Physics Chapter 8- Momentum Quiz

The momentum of an object depends upon the object's ___________&_____________.

• size and shape

• mass and speed

• mass and veloctiy

• mass and energy

How do we define impulse?

• A force that is applied at random.

• A force that is applied only for a short period of time.

• Force multiplied by the time of impact

• The time interval that a force lasts.

The total momentum of a system is conserved

• always

• If no external forces act on the system.

• If no internal forces act on the system.

• Never; it’s just an approximation.

A mosquito and a truck have a head-on collision. Splat! Which has a larger change of momentum?

• The mosquito

• The truck

• They have the same change of momentum.

• Can’t say without knowing their initial velocities.

A mosquito and a truck have a head-on collision. Splat! Which has a larger impulse applied to it?

• The mosquito

• The truck

• They have the same impulse.

• Can’t say without knowing their initial velocities.

In order to catch a ball, a baseball player naturally moves their hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the player's hand to be reduced in size mostly because _____

• a resulting impact velocity has lessened

• the momentum change is decreased

• the time of impact is increased

• the time of impact is decreased

• none of the above

What is the total change in the cart's momentum?

• –20 kg m/s

• –10 kg m/s

• 0 kg m/s

• 10 kg m/s

• 30 kg m/s

Based on the numbers shown in the diagram, is momentum conserved in this collision?

• Yes

• No

A lunar vehicle is tested on Earth at a speed of 10 km/h. When the same lunar vehicle travels at the same 10 km/hr on the Moon, its momentum is

• the same

• less

• more

• zero

Your friend says that impulse is the same as momentum. Is he correct?

• Yes, impulse is momentum

• No, impulse is equal to the CHANGE in momentum

• No, impulse is equal to acceleration

• No, impulse is equal to velocity