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Chapter-3Falling Objects and Projectile
Motion
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Overview
• Explore how objects move under the influence of gravity close to the surface of the earth.
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Outline
• Acceleration due to gravity• Falling object• Projectile motion
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Why objects fall to the ground when released?
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How to observe the Acceleration Due to Gravity?
Galileo’s Method
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How to observe the Acceleration Due to Gravity?
Using a Stroboscope
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Q2
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Acceleration Due to Gravity
Slope = g = 9.8 m/s2.
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When you drop objects of different sizes and weights, do they reach the ground at the same time?
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When you drop objects of different sizes and weights, do they reach the ground at the same time?
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Falling Object
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Velocity and Distance for a falling object
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Spread Sheet (Excel)Calculations
t (s) v (m/s) d (m)0 0 01 9.8 4.92 19.6 19.63 29.4 44.14 39.2 78.45 49 122.56 58.8 176.47 68.6 240.18 78.4 313.69 88.2 396.9
10 98 49011 107.8 592.912 117.6 705.613 127.4 828.114 137.2 960.415 147 1102.516 156.8 1254.417 166.6 1416.118 176.4 1587.619 186.2 1768.920 196 1960
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Velocity VERSUS Time graph
y = 9.8x
0
50
100
150
200
250
0 5 10 15 20 25
Time (s)
V (m
/s)
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Distance VERSUS Time graph
0
500
1000
1500
2000
2500
0 5 10 15 20 25
t (s)
d (m
)
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Throwing up a ball
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Velocity and Distance
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Q16
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Velocity VS. Time graph
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A Cartoon Coyote Falling off a Cliff
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Horizontal and Vertical motions
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Q: What determines the time of flight?
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Q: What determines the time of flight?
A: Vertical motion
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Q23
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Target Shooting
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Football in the air
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Angle for maximum Range
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CP1