Free Fall
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Physics of Free Fall: Understanding Motion and Gravity, Slides of Physics
The physics of free fall, where two balls are thrown with the same initial speed but in opposite directions with negligible air resistance. The concept of gravity, the constant acceleration equations, and how to calculate the initial velocity of an object based on its height and time of flight. Additionally, it touches upon exceptions to free fall caused by friction.
Typology: Slides
2012/2013
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Free Fall
Up and Down
Two balls are thrown at the same initial speed, oneupward and one downward with negligible airresistance. When the balls strike the ground the ballthrown upward has a speed equal toA) four times the speed of the ball thrown downward.B) two times the speed of the ball thrown downward.C) the same speed of the ball thrown downward.D) one half the speed of the ball thrown downward.E) one quarter the speed of the ball throwndownward.
Surface Gravity
At the surface of the Earth, gravity creates a nearlyconstant acceleration.
This gravitational acceleration is called
g
•^
g^
= 9.8 m/s
2
and is directed downward.
Note that
g
is an acceleration.
•^
Don’t be fooled by phrases like g-force.
-^
g^
can be used as a unit of acceleration.
Up and Down
The constant accelerationequations apply for
a
g.
The position is now
y
, in the
vertical direction.
0
0
2
y
t
v
gt
y^
^
^
^
^
0 0 0 2 0 2 y
v g v v
v g v
y^
v
t
y
t
v y^0 0
Initialupwardsvelocity
Negative slope =
g
Velocityhere is –
v^0
Exceptions to Free Fall
On Earth’s surface downward acceleration isconstant.
Why do we observe that different objects acceleratedifferently?
•^
Friction reduces the total acceleration.
-^
We think about velocity instead of acceleration.