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

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Presentation transcript:

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

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:

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

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

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

HOW DO THE FORCES EXPERIENCED BY THE TWO BALLS COMPARE?

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

HOW DOES FORCE CHANGE WHEN MASS INCREASES?

Conceptual Physics  Answer Review Questions 1-10 pages  Plug & Chug Q’s 19 & 20  Think & Explain HAVE OUT

MOMENTUM!!!

 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: