1. A Question of Bounces COLLISIONS AND MOMENTUM: PROVING FORCES ARE ALWAYS EQUAL

2. A ball is released from -20cm The ball meets another ball at 0 and bounces back to -7cm Find the change in velocity of the ball Show your calculations Have Out: Speed Bumps & Safe Landings ENTRY TASK:

3. Initial Position (-V i ) Data for Repound Positions (V f )Calculations Gp 1Gp 2Gp 3Gp 4Gp 5Avg Bounce (V f ) V final V initial ∆V (V f -V i ) EXPERIMENT #3: TWO BALLS OF DIFFERENT MASS & VELOCITY FROM 1 ST EXPERIMENT

4. F 1 on 2 = (m * ∆v) / t F = force of ball 1 on ball 2 m = mass of ball 1 ∆v = change in velocity of ball 1 t = time needed to change velocity CALCULATING FORCE (BALL 1) Mass of ball 1Average Mass Ball 1 Gp 1Gp 2Gp 3Gp 4Gp 5 Calculations

5. F 2 on 1 = (m * ∆v) / t F = force of ball 2 on ball 1 m = mass of ball 2 ∆v = change in velocity of ball 2 t = time needed to change velocity CALCULATING FORCE (BALL 2) Mass of ball 2Average Mass Ball 2 Gp 1Gp 2Gp 3Gp 4Gp 5 Calculations

6. HOW DO THE FORCES EXPERIENCED BY THE TWO BALLS COMPARE?

7. (Expected Value – Actual Value) Expected Value CALCULATING PERCENT ERROR X 100

8. HOW DOES FORCE CHANGE WHEN MASS INCREASES?

9. Conceptual Physics  Answer Review Questions 1-10 pages 100-101  Plug & Chug Q’s 19 & 20  Think & Explain 23-24 HAVE OUT

10. MOMENTUM!!!

11.  Revise Science Fair Assignment #1 (Most Due Tuesday)  Complete A Question of Bounces Part 2  Complete Vector Addition in One Dimension  Complete Moving on Impulse Questions HOMEWORK: