Gravity
________: the attractive force between objects; the force that moves objects downhill.
Inertia
________: the tendency of an object to resist to change in motion.
Mass
________: a measure of how much matter is in an object.
Acceleration
________: the rate of which velocity changes.
Newton
________ (N): a unit on measure that equals the force required to accelerate 1 kilogram of a mass at 1 meter per second per second.
Velocity
________: speed in a given direction.
Weight
________: a measure of the force of gravity acting on an object.
Friction
________: the force that two surfaces exert on each other when they rub against each other.