There are two ways to live your life - one is as
though nothing is a miracle, the other is as though everything is a
Questions to ponder
1. Describe the motion of a falling body.
2. What are the forces affecting the motion of a falling body?
In the absence of air friction
I. Motion of objects moving freely under the force of gravity.
Freefall - falling where the only force is gravity
Guy jumps from the 3rd floor onto a tree. Wild stuff
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g = - 9.8 m/s2
Rounding off g we get -10 m/s2
Ex) An object thrown upward at
An object is thrown up at a velocity of 30 m/s
About how long will it take to hit the ground?
Draw the V vs t Plot
A. Motion diagram for free fall on any planet or moon
Top Line: Jupiter
Bottom Line: Moon
D vs t - free fall
A ball is thrown upward. What's the acceleration due to gravity at the peak?
Ex) Compare the displacement of an object dropped during its first second with its displacement after 3 seconds.
Δd = Vit + 1/2aΔt2
Δd = 1/2aΔt2
9 times greater
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