1. Ch 6 Momentum and Collisions

2. Lab Day Objective In this chapter we will learn: – How to calculate momentum and impulse – Conservation of Momentum – Collisions Warm-Up none

3. Exit Ticket None

4. Chapter 6 Section 1 and 2 Objective In this chapter we will learn: – How to calculate momentum and impulse – Conservation of Momentum – Collisions Warm-Up Does a bicycle rolling downhill have momentum?

5. Momentum – P = mv Momentum= mass x velocity Ex: A deer with a mass of 146 kg is running head-on toward you with a speed of 17 m/s. You are going North. Find the momentum of the deer.

6. Impulse- Momentum Theorem-a change in momentum requires that a FORCE be exerted on the object over a period of TIME The change in momentum can be calculated by final – initial Ex: A 0.05 kg is thrown with a velocity of 15 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.02 s. What is the force exerted on the ball by the receiver?

7. Conservation of Momentum Ex: A 63 kg astronaut is on a spacewalk when the tether line to the shuttle breaks. The astronaut is able to throw a 10.0 kg oxygen tank in a direction away from the shuttle with a speed of 12.0 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut starts from rest with re4spect to the shuttle, find the astronaut’s speed with respect to the shuttle after the tank is thrown.

8. Exit Ticket HW – Pg 199 #2 – Pg 201 #3 (the “south” velocity will be negative) – Pg 209 #2 (you need to combine the mass of the fisherman and the boat )

9. Chapter 6 Section 3 Objective In this chapter we will learn: – How to calculate momentum and impulse – Conservation of Momentum – Collisions Warm-Up Get out your HW

10. Collisions Inelastic – 2 objects stick together after colliding – Energy is NOT conserved it is transferred to other forms Elastic – Momentum and KE are conserved

11. Collisions Ex A 1500 kg car traveling at 15.0 m/s to the south collides with a 4500kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after the collision. What is the final velocity of the two-vehicle mass? Ex A 0.015 kg marble sliding to the right at 22.5 cm/s on a frictionless surface makes an elastic head-on collision with a 0.015kg marble moving to the least at 18 cm/s. After the collision, the first marble moves to the left at 18 cm/s. Find the final velocity of the second marble after colliding Verify your answer by calculating the total KE before and after the collision.

12. Exit Ticket Homework Pg 214 # 2 Pg 219 # 2