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# Ch. 3 Vocab.

### vocab

TermDefinition
Newton's second law of motion the acceleration of an object is in the same direction as the net force on the object
friction the force opposes the sliding motion of two surfaces that are touching each other
static friction frictional force that prevents two surfaces from sliding past each other
sliding friction the force that opposes the motion of two surfaces sliding past each other
air resistance opposes the motion of objects that move through the air
gravity an attractive force between any two objects that depends on the masses of the objects and the distance between them
weight the gravitational force exerted on and object
centripetal acceleration acceleration toward the center of a curved or circular path
centripetal force the net force exerted toward the center of a curved path
Newton's third law of motion describes action-reaction pairs this way: when one object exerts a force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction
momentum the product of and objects mass and velocity