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# chapter 3

### section 1-3

TermDefinition
Newton's second law of motion States that the acceleration of an object is in the same direction as the net force on the objectm and that the acceleration equals the net force divided by the mass.
Friction Force that oppose that sliding motion between two touching surfaces.
Static Friction frictional force that prevents two surfaces from sliding past each other.
Sliding Friction frictional force that opposes the motion of two surfaces sliding past each other.
Air resistance force that opposes the motion of objects that move through the air.
Gravity attractive force between two objects that depends on the masses of the objects and the distance between
Weight gravitational force exerted on an object
Centripetal acceleration acceleration of an object toward the center of a curved or circular path
Centripetal force a net force that is directed toward the center of a curved or circular path
Newton's third law of motion states that when one object exerts a force on a second object, the second object exerts a force on the first object that is equal in strength and in the opposite direction.
Momentum property of a moving object that equals its mass times its velocity