| Term | Definition |
|---|
| Newton's second law of motion | describes the acceleration of an object in the direction of the net force applied to it |
| air resistance | frictional force air exerts on a moving object; acts opposite in direction to the object's motion |
| terminal velocity | the greatest velocity reached by a fallin object |
| projectile | any object shot or thrown through the air; all projectiles have both horizontal and vertical velocities |
| centripetal acceleration | acceleration toward the center of a circle by an object moving along a circular path |
| centripetal force | the force that causes an object moving along a circular path to move toward the center of a circle |
| Newton's third law of motion | describes action-reaction pairs; for every action force, there is an equal and opposite reaction force |
| momentum | a property of any moving object the momentum of an object is the product of its mass and velocity |
| law of conservation of momentum | a law stating that the total momentum of a group of objects is conserved unless a net force acts on the objects |
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