1. Section 1: Momentum and Impulse

2. Intro Video:

3. 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?

4. Momentum: Momentum is like inertia in motion.
Momentum = Mass x Velocity
Or p = mv
Problem: A 200kg snowball travels with a velocity of 2 m/s. Find its momentum:
Question: Would momentum be a vector or scalar quantity and why?

5. Impact Force: Force to create a change in momentum

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

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

8. Impulse is the change in momentum 1) Increasing the _______& ______ of the impact 2) Increasing the change in ___________.
F·t = mVf - mVi

10. Sample Problem 1: Impulse b) Force to stop in .1s
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 .1s

11. Sample Problem 2: Find the following for the .5kg ball:
a) Change in momentum
b) Impulse
c) Find the force if the moment of impact was .5s

12. Compression of a golf ball

13. Turbines

16. Reduce the impact force, so don’t forget to wear your helmet!

17. Warm-up: Find the Impulse for Each Situation
Warm-up: Find the Impulse for Each Situation. The mass of the car is 1000kg

18. Warm-up: A cannon fires a 250kg projectile at 30m/s
Warm-up: A cannon fires a 250kg projectile at 30m/s. If the force exerted by the cannon is 3,000N, find the following:
Find the initial momentum before firing:
Find the final momentum when the velocity is 300m/s:
Find the change in momentum (impulse):
4) Find the time the force is applied:

19. Warm up: A 2. 5 kg ball strikes a wall with a velocity of 7
Warm up: A 2.5 kg ball strikes a wall with a velocity of 7.5 m/s and bounces back with a velocity of 5 m/s. If ball is in contact with the wall for .25s, find the force on the ball.

20. Quiz (10 pts): The following graph shows the force vs time the impact of a bat hitting a .4 kg ball. Use this information to find the following:
Change in momentum.
Final velocity of ball if it is initially at rest.

21. Momentum Quiz: (4 points each)
A car that has a mass of 2,000 kg is initially traveling at 20 m/s when it hits an oncoming truck traveling at 40 m/s. If the car rebounds backwards off of the truck with a speed of 10 m/s, find the following:
Initial momentum of the car:
b) Final momentum of the car:
c) Impulse (change in momentum) of the car:
d) Force of contact if the collision time is seconds.

22. Warm up: Find the total momentum before and after the collision.

23. Extreme Egg Drop Lab
Objective: Drop 3 eggs from 300 feet that survive. Rules: No dimension can be larger than 30 inch, max weight 5 lbs, no fluids or jells allowed, & max of 2 students per group. Grading: No eggs break- 30/30 1 egg breaks – 25/30 2 eggs break – 20/30 3 eggs break – 15 /30