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Rotational Inertia
St. Mary's U. Astronomy and Physics Dept.
|Onsite|
St.
Mary's U. Astronomy and Physics Dept.
|
Onsite |

3rd Law of Motion

Action/Reaction
- NASA
(right click, save as)


Which way is this skater moving?

For every action
there is an equal but opposite reaction
|

"Press on a rock and the
rock presses on you
(with an equal, but opposite force)"
- Newton


Skateboarder
Skateboarder 2

When object A exerts
a force on object B,
Object B exerts
an equal force on A
but in the opposite direction |

Forces Always
Come in Pairs


Collisions and 3rd Law
St. Mary's Physics


A lamp applies a force of 10 N
to a table.
What force does the table
apply on the lamp?
Which direction is this force
applied?
UP


Earth pulls
down on you.
That's
half the story...
You pull up on the earth. Equal. Opposite.



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