1.
GRAVITY, M
ASS
AND
DISTANCE
W
HAT’S
THE
ATTRACTION?
2.
WHAT GOES UP MUST COME DOWN
More on this later…….
3.
GRAVITY
Everything in the universe has it
Everything is attracted to
everything else
You are are attracted to your
homework, your homework is
attracted to your calculator, your
calculator is attracted to your
pencil and your pencil is
attracted to you!
If everything is so attractive, WHY
DON’T YOU DO YOUR
HOMEWORK?
What is it?
4.
GRAVITY
The strength of this
attractive force
(gravity) depends
on only two things,
the
MASS of any two
objects
and the
DISTANCE between
the centers
of those objects
5.
WHAT IS THIS ATTRACTIVE RELATIONSHIP?
One is very simple: the
relationship between mass and
gravity.
The greater the mass, the greater
the force of gravity – pure and
simple! It is a direct
relationship
For example, if an object has 5
times more mass than another
object, the first object will exert
6.
GRAVITY AND MASS
Which mass exerts a greater force of gravity and why?
7.
JUST THE OPPOSITE
The relationship between
distance and gravity is a little
more complicated.
As the distance between the
objects increases, the force of
gravity decreases. This is a
type of indirect (or inverse)
relationship
The farther apart objects are,
8.
BUT WAIT, THERE’S MORE!
Here is the complicated part: If the
distance between the objects increases
by 3 times, the force of gravity
decreases by 9 times
Can you figure out the mathematical
relationship between 3 and 9?
The same relationship exists between
4 and 16
5 and 25
9.
“PHYSICS TALK”
This is referred to as the inverse square law
The gravitational effect between objects varies inversely to the square of
the distance between them.
Huh?
10.
“SIMPLE TALK”
As the distance between
two objects get
LARGER, the force of
gravity between them
gets smaller.
11.
YOU TRY
How does the force of gravity
change?
1
2
Does the force of gravity decrease
by
a. 1/2 b. 1/4
c. 1/3
13.
WHAT GOES UP MUST COME DOWN
Down is toward the center of the mass
Up is the other way
Goes and Comes means the motion of the What has been changed
Must means it has no choice!
Why no choice?
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