Physics Unit 3

Which of the following is an equation for IMPULSE

• p=mv

• (m1v1) + (m2v2) = (m1+m2)Vf

• Pf-Pi

• (m1v1)+(m2v2)=(m1vf1)+(m2vf2)

Solve: An 5 kg box is traveling at 13 m/s; what is the momentum?

• 65 kgm/s

• 65kg

• 65 m/s

• 65 N

A 2 kg ball is rolling across a field with velocity of 6 m/s; it starts to roll faster when it reaches a hill_ it reaches 17 m/s. What is the change in momentum.

• 34 kgm/s

• 22 kgm/s

• -22 kgm/s

• 12 kgm.s

A rocket launches into space with a force of 90N; it takes 5 seconds to reach the exosphere. What is the IMPULSE of the rocket?

• 450kgm/s

• 18 kgm/s

• 95 kgm/s

• 0.56 kgm/s

Momentum is conserved in which collisions:

• Elastic

• Inelastic

• Momentum is never conserved

• Momentum is always conserved (so both)

Which of the following describe an elastic collision?

• The objects stick together

• The objects bounce apart

Which equation demonstrates IMPULSE?

• pf-pi

• fxt

• (m2v2)-(m1v1)

• (m1v1)-(m2v2)

A 0.250 kg cart moving at 0.400 m/s has how much momentum?

• 0.1 kgm/s

• 1 kgm/s

• 0.01kgm/s

• 0.001 kgm/s

An impulse occurs when a ____ is acting upon an object for a given amount of ____ in order to cause a change in ____.

• force; acceleration; mass

• mass; acceleration; force

• force; time; momentum

• momentum; time; force

An object is moving with a mass of 60 kg and a velocity of 5 m/s. It drops down a ramp, and has a velocity of 10 m/s. What is the impulse of this object?

• 300 kgm/s

• -300 kgm/s

• 100 kgm/s

• -100 kgm/s