LAB

1
LAB 12

• BALLISTIC PENDULUM

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GOALS

• TO USE A BALLISTIC PENDULUM TO DETERMINE MUZZLE
  VELOCITY OF A MARBLE LAUNCHER
• TO DETERMINE THE KE LOST IN THE COLLISION
• TO SIMULATE A BALLISTIC PENDULUM AND COMPARE
  RESULTS.

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PROCEDURE

• SHOOT THE PROJECTILE INTO THE BALLISTIC PENDULUM
  WITH PHOTOGATE TIMER IN PLACE
• MEASURE THE MAXIMUM ANGLE OF DEFLECTION OF THE
  PENDULUM
• RECORD PHOTOGATE TIME TO DETERMINE V PHOTO
• REPEAT FOR ALL FIVE NOTCHES OF THE LAUNCHER
• BUILD AN I.P. BALLISTIC PENDULUM
• REPEAT THE EXPERIMENT WITH THE VIRTUAL PENDULUM
• COMPARE RESULTS FOR EACH

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Ballistic Pendulum
At Impact
At Highest Swing
Before Impact
Q
Vo ?
V
m
Dh
M
Vo
Po Pf
KE lost PE gain
mvo (Mm) V
½(Mm)V2 (Mm) gDh
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Ballistic Pendulum Equation
½(Mm)V2 (Mm) gDh
mvo (Mm) V
V2 2gDh
vo (Mm) V
V 2gDh
m
2gDh
vo (Mm)
m
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Determine Dh from Q
L length of pend
At Highest Swing
(pivot to center of bob)
Dh L - Y
L
Q
Y
Y L cos Q
Dh
Dh L - L cos Q
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DATA TABLE 1
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DATA TABLE 2
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K.E. ANALYSIS
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GRAPH 1 REAL PENDULUM
Marble Vo
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GRAPH 2 I.P. PENDULUM
Marble Vo
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WRITE-UP

• SCREEN DUMP OF IP PEND
• SHOW BALLISTIC PEND EQ PROOF
• DATA TABLES
• GRAPHS
• TRENDLINES
• GRAPH ANALYSIS
• CONCLUSION

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LAB 12

• DATA ANALYSIS

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GRAPH 1 REAL PENDULUM
2gDh
vo (Mm)
m
y m x b
Marble Vo
(Mm)
Slope
m