Physics Unit 2.3

What is the formula for momentum?

• p=mv

• p=mgh

• p=Fd

• p=1/2 mv^2

What does the principle of conservation of momentum state?

• Total energy is conserved in a closed system.

• Total momentum before an event is equal to total momentum after.

• Momentum can be created or destroyed.

• Momentum depends only on mass.

A 5 kg cart is moving at a velocity of 2 m/s. What is its momentum?

• 5 kg·m/s

• 10 kg·m/s

• 15 kg·m/s

• 20 kg·m/s

If two objects collide and stick together, what type of collision is this?

• Elastic

• Inelastic

• Perfectly elastic

• Superelastic

A soccer ball (0.5 kg) is kicked with a velocity of 10 m/s. What is its momentum?

• 2.5 kg·m/s

• 5 kg·m/s

• 10 kg·m/s

• 20 kg·m/s

What is impulse?

• The rate of doing work

• Change in momentum

• Force multiplied by distance

• Kinetic energy

A force of 10 N is applied to an object for 3 seconds. What is the impulse delivered to the object?

• 10 Ns

• 30 Ns

• 5 Ns

• 15 Ns

In a collision, if the momentum before is 20 kg·m/s and after is 15 kg·m/s, what is the change in momentum?

• 5 kg·m/s

• -5 kg·m/s

• 20 kg·m/s

• 15 kg·m/s

If a car (1500 kg) comes to a stop from a velocity of 20 m/s, what is the impulse experienced by the car?

• 3000 Ns

• 15000 Ns

• -30000 Ns

• 0 Ns

Which of the following best describes an elastic collision?

• Objects stick together after colliding.

• Kinetic energy is conserved.

• Momentum is not conserved.

• Both objects are permanently deformed.