Warm up A 3.00 kg crate slides down a 7 m ramp. The height of the ramp is 5 m off the ground. The velocity of the crate at the bottom of the ramp is 5.

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Presentation transcript:

Warm up A 3.00 kg crate slides down a 7 m ramp. The height of the ramp is 5 m off the ground. The velocity of the crate at the bottom of the ramp is 5 m/s. Is there friction on the ramp and if what is that frictional force? 5 m 7 m

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Momentum

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Momentum is closely related to the Force

Impulse

Impulse Example A 0.4 kg soccer ball approaches a player horizontally with a velocity of 18 m/s to the left. The player strikes the ball and causes it to move in the opposite direction with a velocity of 22 m/s. What impulse was delivered to the ball by the player?

Impulse Example A 2500 kg car traveling to the north is slowed down uniformly from an initial velocity of 20.0 m/s by a 6250 N braking force acting opposite the car’s motion. Use the impulse-momentum theorem to answer the following questions What is car’s velocity after 2.5 s? How long does it take the car to come to a complete stop?

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Conservation of Momentum

A 63 kg astronaut is in space and throws a 10 kg oxygen tank towards Earth with a speed of 12.0 m/s. Assuming the astronaut starts from rest, find the final velocity of the astronaut after the throw.

Conservation of Momentum in Space Linear Momentum in Space

Collisions

Elastic Collision A 16 kg canoe moving to the left at 12 m/s makes an elastic head- on-collision with a 4.0 kg raft moving to the right at 6.0 m/s. After the collision, the raft moves to the left at 22.7 m/s. Disregard any water effects. Find the velocity of the canoe after the collision.

Inelastic Collisions A 1500 kg car traveling at 15 m/s to the south collides with a 4500 kg truck that is initially at rest. The car and truck stick together and move together after the collisions. What is the final velocity of the two vehicle mass?

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