the force that opposes motion between two surfaces that are touching
when the only force acting on an object is gravity; all objects near Earth fall at the SAME SPEED (regardless of how heavy/massive they are!!!)
equal and opposite forces
whenever a force is exerted, there is another force that is equal in size and opposite in direction
objects in motion tend to stay in the same motion; objects at rest tend to stay at rest
an object at rest has ______ momentum
SI Unit for force
Gravity depends upon...
the masses of the two objects and the distance between them (more mass means more gravity, more distance means less gravity)
Weight on planets
Planet has more mass = planet has more gravity = things weigh more
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