Today's physics lesson will cover momentum. Momentum is defined as mass multiplied by velocity (P=mv). A slow moving truck and fast moving roller skate can have the same momentum if the product of their masses and velocities are equal, such as a 1000kg truck moving at 0.01m/s and a 1kg skate at 10m/s. For cars traveling at the same speed, their momentum is determined by their masses, so a 2000kg car has twice the momentum of a 1000kg car moving at 10m/s. Examples of momentum transfers can be seen in football collisions.

1. Good Morning! Today we will: Take some notes Work some problems Please do before the tardy bell: Get your lab book Get out something to write with

2. Moving Objects Have Momentum

3. So What’ s Momentum ? Momentum = mass x velocity This can be abbreviated to : P = mv Can a really slow moving truck and an extremely fast roller skate have the same momentum?

4. Question : Under what circumstances would the roller skate and the truck have the same momentum ? The roller skate and truck can have the same momentum if the product of the mass and velocity of the skate equal the product of the mass and velocity of the truck. A 1000 kg truck moving at 0.01 m/sec has the same momentum as a 1 kg skate moving at 10 m/sec. Both have a momentum of 10 kg m/sec. ( 1000 x .01 = 1 x 10 = 10 ) 1000 kg 1 kg .01 m/sec 10 m/sec

5. Momentum and Cars If two cars are traveling at the same speed, what is the determining factor of the momentum of each? their masses Car A has a mass of 1000 kg and Car B has a mass of 2000 kg. If they are each traveling at 10 m/s, do they have the same momentum? Explain.

6. Momentum and People We see lots of examples of momentum (and the transfer of momentum) in football collisions Big Hit #1 Big Hit #2

7. Keep in Mind For optimum momentum, you want your object to be both big AND fast Terry Tate

8. The faster you push me… the farther I get So…the more momentum you have, the further you will roll Two ways to have more momentum: increase mass increase velocity