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

What is Momentum? ENTRY TASK:

Tools of the Trade Article Head On Collision Article Vector Addition in One Dimension Questions? HAVE OUT

Challenge: Will the collision force be equal even when the initial positions are of our own choosing? OR Can we achieve an even lower % Error in our experiment? A QUESTION OF BOUNCES PART 2

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 #2: TWO BALLS OF EQUAL MASS & VELOCITY OF OUR CHOOSING

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

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

 Complete A Question of Bounces Part 2  Read Conceptual Physics Pages  Answer Review Questions 1-10 pages  Plug & Chug Q’s 19 & 20  Think & Explain  Read “Moving on Impulse” Answer all Questions HOMEWORK: