PHYSICS LAB

LAB #3 INTRODUCTION TO INTERACTIVE PHYSICS

GOALS 1 TO LEARN TO CREATE MECHANICAL SIMULATIONS AND TAKE MEASUREMENTS 2 TO DISCOVER THE FACTORS WHICH DETERMINE THE STOPPING DISTANCE (D) OF A CAR. –D VS INITIAL SPEED (Vo) –D VS MASS (m) –D VS GRAVITY (g)

SKETCH m Vo D m Vf = 0

Vo Vf = 0 D LAB #3: I.P. SIMULATION Use ruler to measure D

PROCEDURE PART A: D vs Vo –CREATE A MASS ON AN ANCHORED PLATFORM –CHANGE THE Vo OF THE MASS FOR ATLEAST 6 TRIALS –MEASURE THE STOPPING DISTANCE FOR EACH TRIAL

PROCEDURE PART B: D vs MASS (m) –USE THE SAME SIMULATION –KEEP Vo CONSTANT –CHANGE MASS- 6 TRIALS –MEASURE D FOR EACH TRIAL

PROCEDURE PART C: D vs GRAVITY (g) –USE THE SAME SIMULATION –KEEP Vo & MASS CONSTANT –CHANGE g TO EACH PLANET –MEASURE D FOR EACH TRIAL

DATA TABLE A: d vs Vo ???? Constants:

GRAPH #1: D vs Vo INITIAL VELOCITY (m/s) STOPPING DISTANCE (m)

Vo 2 (m 2 /s 2 ) GRAPH #2: D vs ?V? STOPPING DISTANCE (m) V something?

RECALL: Lab #1: Area vs Radius RADIUS AREA RADIUS ^2 A  R 2 AREA

DATA TABLE B: d vs m Constants:

GRAPH #3: D vs mass MASS (kg) STOPPING DISTANCE (m)

DATA TABLE C: d vs g ???? Constants:

GRAPH #4: D vs g GRAVITY(g) (N/kg) STOPPING DISTANCE (m)

GRAPH #5: D vs g? INVERSE GRAVITY (kg/N) STOPPING DISTANCE (m) g Something?

WRITE-UP ABSTRACT: –BACKGROUND –METHOD SCREEN DUMP OF IP SIM DATA TABLES GRAPHS –TRENDLINES –GRAPH ANALYSIS CONCLUSION

LAB #3 DATA ANALYSIS

GRAPH #1: D vs Vo INITIAL VELOCITY (m/s) STOPPING DISTANCE (m) D  V n n = 2,3,?

Vo 2 (m 2 /s 2 ) GRAPH #2: D vs ?V? STOPPING DISTANCE (m) D  Vo 2

Cookie Law 2r r A  r 2 4 x more cookie!! How much more cookie?

GRAPH #3: D vs mass MASS (kg) STOPPING DISTANCE (m) D independent of mass

GRAPH #4: D vs g GRAVITY(g) (N/kg) STOPPING DISTANCE (m) D  1/g n n = 1,2,?

GRAPH #5: D vs g? INVERSE GRAVITY (kg/N) STOPPING DISTANCE (m) D  1/g