a question of bounces collisions and momentum: proving forces are always equal

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 (-Vi)

Data for Repound Positions (Vf)

Calculations

Gp 1 Gp 2 Gp 3 Gp 4 Gp 5 Avg Bounce (Vf)

Vfinal Vinitial ∆V(Vf-Vi)

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

CHOOSING

F1 on 2 = (m * ∆v) / t

F = force of ball 1 on ball 2m = mass of ball 1∆v = change in velocity of ball 1t = time needed to change velocity

CALCULATING FORCE(BALL 1)

Mass of ball 1 Average Mass Ball

1Gp 1 Gp 2 Gp 3 Gp 4 Gp 5

Calculations

F2 on 1 = (m * ∆v) / t





Calculations

HOW DO THE FORCES EXPERIENCED BY THE TWO BALLS

COMPARE?

(Expected Value – Actual Value)Expected Value

CALCULATING PERCENT ERROR

X 100

Initial Position (-Vi)

Data for Repound Positions (Vf)

Calculations

Gp 1 Gp 2 Gp 3 Gp 4 Gp 5 Avg Bounce (Vf)

Vfinal Vinitial ∆V(Vf-Vi)

EXPERIMENT #3: TWO BALLS OF DIFFERENT MASS & VELOCITY FROM 1ST

EXPERIMENT

F1 on 2 = (m * ∆v) / t





Calculations

F2 on 1 = (m * ∆v) / t





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 86-90Answer Review Questions 1-10 pages 100-101Plug & Chug Q’s 19 & 20Think & Explain 23-24

Read “Moving on Impulse” Answer all Questions

HOMEWORK:

a question of bounces collisions and momentum: proving forces are always equal

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