1. Warm-Up 10/17/13
Some force occurs through transfer. An example is the force of the white cue ball on a colored pool ball.
Sketch BEFORE and AFTER drawings of the pool ball scenario.
Draw in arrows to show the magnitude (size) and the direction of the velocity for the object that is moving in the BEFORE and AFTER sketches.

2. Thursday 10/17/13
12.3 Momentum

3. Momentum = Mass x Velocity
Momentum is the product of an object’s mass and velocity.
Objects with a large momentum are hard to stop! Ex) Semi truck vs. bicycle
Momentum = Mass x Velocity

4. Practice
Pick two of the following cars and imagine the momentum of each in a car crash.
Remember: the larger the momentum, the harder it is to stop!

5. Momentum = Mass x Velocity
Vehicle
Curb Weight (kg)
Velocity (m/s)
Smart Car
822
24.75
(55mph)
Pontiac G6
1,571
Chevy Impala
1,616
F150
2,130
GMC Yukon
2,643
Semi+trailer
9,091
38’ School Bus
10,000
Momentum = Mass x Velocity

6. Conservation of Momentum
Law of Conservation of Momentum= if no net force acts on a system (2+ objects) then the total system does not change.
Momentum is not gained or lost in collisions

8. Calculating Conservation
Momentum of cue ball = (mcb)(vcb)
Momentum of yellow ball = (myb)(vyb)
Conservation requires that the momentum before and after is the same!
(mcb)(vcb) = (myb)(vyb)

9. Your Job
Take the next minutes and design your egg’s container for tomorrow’s egg drop. Show me the sketch and materials list.
HW: Newton’s Laws and Momentum WS DUE Monday
ALL EGG MATERIALS NEED TO BE BROUGHT IN TOMORROW