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Transcript
```Newton’s Second Law of Motion
 Force is proportional to mass and
acceleration
 F= ma
 Net external force = mass x acceleration
 If you apply
more force to
an object, it
accelerates at
a higher rate.
 If an object
has more
mass it
accelerates at
a lower rate
because mass
has inertia.
Newton's Second Law
Three forms of the second law:
Newton’s Third Law
 For every action, there is an
equal and opposite reaction
 Forces always exist in pairs;
these are called
action-reaction pairs
 Action-reaction pairs do not cancel each
other out because the forces are acting on
different objects
```
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