physics lab lab #3 introduction to interactive physics
TRANSCRIPT
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PHYSICS LAB
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LAB #3LAB #3INTRODUCTION TO
INTERACTIVE PHYSICS
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GOALSGOALS• 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)
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SKETCHSKETCH
mVo
D
m
Vf = 0
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Vo Vf = 0
D
LAB #3: I.P. SIMULATIONLAB #3: I.P. SIMULATION
Use ruler tomeasure D
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PROCEDUREPROCEDURE
• 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
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PROCEDUREPROCEDURE• PART B: D vs MASS (m)
–USE THE SAME SIMULATION
–KEEP Vo CONSTANT
–CHANGE MASS- 6 TRIALS
–MEASURE D FOR EACH TRIAL
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PROCEDUREPROCEDURE• PART C: D vs GRAVITY (g)
–USE THE SAME SIMULATION
–KEEP Vo & MASS CONSTANT
–CHANGE g TO EACH PLANET
–MEASURE D FOR EACH TRIAL
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DATA TABLE A: d vs DATA TABLE A: d vs VoVo
????
Constants:
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GRAPH #1: D vs VoGRAPH #1: D vs Vo
INITIAL VELOCITY (m/s)
ST
OP
PIN
G D
IST
AN
CE
(m
)
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Vo2 (m2/s2)
GRAPH #2: D vs ?V?GRAPH #2: D vs ?V?S
TO
PP
ING
DIS
TA
NC
E (
m)
V something?
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RECALL: Lab #1: Area vs RECALL: Lab #1: Area vs RadiusRadius
RADIUS
AR
EA
RADIUS ^2
A R2
AR
EA
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DATA TABLE B: d vs mDATA TABLE B: d vs mConstants:
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GRAPH #3: D vs massGRAPH #3: D vs mass
MASS (kg)
ST
OP
PIN
G D
IST
AN
CE
(m
)
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DATA TABLE C: d vs g
????
Constants:
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GRAPH #4: D vs gGRAPH #4: D vs g
GRAVITY(g) (N/kg)
ST
OP
PIN
G D
IST
AN
CE
(m
)
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GRAPH #5: D vs g?GRAPH #5: D vs g?
INVERSE GRAVITY (kg/N)
ST
OP
PIN
G D
IST
AN
CE
(m
)
g Something?
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WRITE-UPWRITE-UP• ABSTRACT:
– BACKGROUND
– METHOD
• SCREEN DUMP OF IP SIM
• DATA TABLES
• GRAPHS– TRENDLINES
– GRAPH ANALYSIS
• CONCLUSION
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LAB #3
DATA ANALYSIS
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GRAPH #1: D vs Vo
INITIAL VELOCITY (m/s)
ST
OP
PIN
G D
IST
AN
CE
(m
) D Vn
n = 2,3,?
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Vo2 (m2/s2)
GRAPH #2: D vs ?V?S
TO
PP
ING
DIS
TA
NC
E (
m) D Vo2
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Cookie Law
2r r
A r2
4 x more cookie!!
How much more
cookie?
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GRAPH #3: D vs mass
MASS (kg)
ST
OP
PIN
G D
IST
AN
CE
(m
)
D independent of mass
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GRAPH #4: D vs g
GRAVITY(g) (N/kg)
ST
OP
PIN
G D
IST
AN
CE
(m
)
D 1/gn
n = 1,2,?
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GRAPH #5: D vs g?
INVERSE GRAVITY (kg/N)
ST
OP
PIN
G D
IST
AN
CE
(m
)
D 1/g