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Internal force
applied to a system from within the system
External force
applied to a system from outside the system
1st Law
-Law of inertia
-a body will maintain a state of rest or constant velocity unless acted upon by an external force
2nd law
Law of Acceleration
-F=ma
Effect of force in 2D
a net external force can produce:
-a change in speed
-a change in direction
-a change in both speed and direction
3rd Law
Law of Reaction
-for every action there is an equal and opposite reaction