1. Section 1: Momentum and Impulse

2. Just a few Q’s What is your understanding of momentum?
What factors cause an object to have momentum?
If an object has momentum, what does that tell you about it?

3. Notes: Momentum: Momentum is like inertia in motion.
Momentum = Mass x Velocity
Or p = mv
Problem: A .2kg baseball approaches the plate with a velocity 20m/s. Find its momentum.

4. What is impact???

5. Balloon Toss Demo:
Get a partner and fill one balloon. Referrals to those who throw them at each other. 

6. Impulse: Change in momentum
Derivation:
When objects are stopped slowly…..
When objects are stopped quickly…..
(Demo: Desk Jump)

7. Sample Problem 1: Impulse b) Force to stop in .009s
Find the following for a .5kg baseball when colliding with a wall and coming to a stop from 10m/s.
Impulse
b) Force to stop in .009s

8. Sample Problem 2: Find the following for the .5kg ball:
a) Change in momentum
b) Impulse
c) Force to stop in .009s

9. How can I increase the impulse?

12. Reduce the impact force! Don’t forget to wear your helmet!

13. Compression of a golf ball

14. Turbines

15. Example: Find the Impulse for Each Situation
Example: Find the Impulse for Each Situation. The mass of the car is 1000kg

16. Collisions
MOMENTUM IS ALWAYS CONSERVED Elastic Collisions: Momentum & Kinetic Energy are conserved; things don’t stick together. Inelastic Collisions: Momentum is conserved, but Kinetic Energy is not.

17. Find the total momentum & EK before and after the collision
Find the total momentum & EK before and after the collision. What type of collision is this?

18. Please abide by the following rules so that it
Egg Drop Project Due 12/13/13
Objective: Pack a single, fresh, hen’s egg so well that when it is dropped from the 300 building 2nd story landing (~15 ft), it will not break AND will land in the target.
Please abide by the following rules so that it
is fun for all.
Fresh eggs only (will be provided on 12/13)
No parachutes
Maximum dimensions 6” x 6” x 6”
You may use a suspension medium (packing peanuts, bubble wrap, jello, etc.), but you must be able to get the egg inside on due date.

19. Egg Drop Project Due 12/13/13
Grading: 3 drops maximum (45 pts) 15 pts: lands within 0.5 m of target center. 10 pts: lands within 1.0 m of target center. 5 pts: lans within 2.0 m of target center