Which is Constant Velocity? 1. 2. 3.. Momentum Which one has more momentum a fast car or a slow car? 1. 2.

Which is Constant Which is Constant Velocity?Velocity?

86%

14% 0%

Constant Velocity No Velocity Increasing Velocity

1.

2.

3.

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MomentumMomentum

Which one has more Which one has more momentum a fast car or a slow momentum a fast car or a slow

car?car?

80%

20%

Fast Slow

1.2.

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Which one has more momentum a Which one has more momentum a large train or a shopping cart large train or a shopping cart traveling at the same speed?traveling at the same speed?

63%

38%

Large Train Shopping Cart

1.1. Large TrainLarge Train

2.2. Shopping CartShopping Cart

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MomentumMomentum•In science, In science,

– momentum momentum = mass * velocity= mass * velocity

Momentum Equation:Momentum Equation:p = m * vp = m * v

–Units= kg x m/sUnits= kg x m/s

What is the momentum of a 75 What is the momentum of a 75 kg speed skater moving forward kg speed skater moving forward at 16 m/s?at 16 m/s?

What is the momentum of a 48.5 What is the momentum of a 48.5 kg passenger on a train stopped kg passenger on a train stopped on the tracks?on the tracks?

CollisionsCollisions• Law of Law of

Conservation of Conservation of MomentumMomentum– Momentum is Momentum is

always always Transferred Transferred From One From One Moving Object Moving Object to Another to Another Object!Object!

– VideoVideo

What would happen to a shopping cart What would happen to a shopping cart sitting in the middle of a parking lot if a sitting in the middle of a parking lot if a car bumped into it?car bumped into it?

1.1. MoveMove2.2. Stay StationaryStay Stationary

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What caused the shopping What caused the shopping cart to move?cart to move?

The law of conservation of The law of conservation of momentum can be used to calculate momentum can be used to calculate

the speed of the cart.the speed of the cart.

• Lets say the car has a mass of Lets say the car has a mass of 1,400 kg and was traveling at a 1,400 kg and was traveling at a speed of 2.5 m/s. If all the speed of 2.5 m/s. If all the momentum from the car was momentum from the car was transferred to the 35 kg shopping transferred to the 35 kg shopping cart, how fast would the cart be cart, how fast would the cart be moving?moving?

CollisionsCollisions

• Momentum is always conservedMomentum is always conserved• Therefore…Therefore…

– Momentum can be trxfered from one Momentum can be trxfered from one moving object and cause another moving object and cause another object to moveobject to move

Conservation of Momentum Video

Conservation of Momentum Video 2