Unit 2 Class Notes

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Unit 2 Class Notes
The Kinematics Equations (1D Equations of Motion)

• Accelerated Physics

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Day 4

• Throw-Ups, Come-Downs, Throw-Downs

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UP , DOWN -
a -9.8 m/s2
v2 0 (at the top)
v1 20 m/s
a -9.8 m/s2
v2 0 m/s
To solve for t, use the quadratic formula ?
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UP , DOWN -
a -9.8 m/s2
Dt12 Dt23
v2 0 (at the top)
v3 -v1
Two VERY important things to know about the case
where you throw an object up and catch it at the
same height.
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v2 0 m/s
v2 0 m/s
a -9.8 m/s2
a -9.8 m/s2
Dx 30 m
v 1 24.25 m/s
Due to the fact that the ball is thrown and
caught at the same height
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Dx -1 m
v1 24.25 m/s
a -9.8 m/s2
To solve for t, use the quadratic formula ?
Only positive times make physical sense
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A man launches a popcorn ball straight up into
the air. It reaches its peak, and then begins to
fall back to the ground. 4 seconds after it was
released from the mans hand, a bird catches the
ball 20 ft above the ground. What was the
velocity at which the ball left the mans hand?
Dt 4 sec
a -32.2 ft/s2
Dx 20 ft
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