Momentum.

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Presentation transcript:

Momentum

What is Momentum? Momentum – tendency of objects to keep going in the same direction with the same speed Depends on mass and velocity Has direction

The momentum of a ball depends on its mass and velocity Ball B has more momentum than ball A

The momentum of a ball depends on direction too

Which has greater momentum: a train at rest or a moving skateboard? Question Which has greater momentum: a train at rest or a moving skateboard? The moving skateboard has a greater momentum because it has a velocity. The train at rest has a greater mass, but zero velocity.

Conservation of Momentum Conservation of Momentum – momentum cannot be created or destroyed, only transferred p before = p after VIDEO

Collisions Collision – occurs when two or more objects hit each other During a collision, momentum is transferred from one object to another because Momentum is conserved.

Collisions Elastic Collision – objects bounce off each other Inelastic Collision – objects stick to each other

Practice A 1200 kg car drives west at 25 m/s for 3 hours. What is the car’s momentum? (1200 kg) × (25 m/s) = 30,000 [kg m/s] west

Practice (1300 kg) × (13.5 m/s) = 17,550 kg m/s north Motorcycle A car is traveling at a velocity of 13.5 m/s north on a straight road. The mass of the car is 1,300 kg. A motorcycle passes the car at a speed of 30 m/s. The motorcycle (with rider) has a mass of 350 kg. Calculate and compare the momentum of the car and motorcycle. Car (1300 kg) × (13.5 m/s) = 17,550 kg m/s north Motorcycle (350 kg) × (30 m/s) = 10,500 kg m/s north

Practice (15 kg m/s) ÷ (30 m/s) = .5 kg A ball moving at 30 m/s has a momentum of 15 kg m/s. What is the mass of the ball? (15 kg m/s) ÷ (30 m/s) = .5 kg

PRACTICE A 700 Kg boat moves with the momentum of 120,000 kg*m/s, what is the velocity of the boat? v=p/m v=120,000 kg*m/s /700 kg v= 171.43 m/s

PRACTICE A 150 kg astronaut in space throws a 5 kg wrench at a speed of 15 m/s, which best describes her velocity? Greater than 15 m/s same direction to wrench Less than 15 m/s opposite direction to wrench Greater than 15 m/s opposite to wrench D.

PRACTICE A 6 kg ball is moving at 6 m/s to the right and a 8 kg ball is moving at 5 m/s to the left. What is the total momentum of the system? (6kg)(6m/s)=36kg*m/s right (8kg)(5m/s)=40kg*m/s left System momentum=4kg*m/s left