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: