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9Sci CH4
9th Science CH4 Acceleration and Motion
| Term | Definition |
|---|---|
| air resistance | frictional force air exerts on a moving object; acts opposite in direction to the object’s motion; the amount of air resistance depends on an object’s shape, density, speed, and size |
| artificial satellite | human-made device that orbits Earth; used for communication, weather-monitoring, military, and scientific purposes |
| centripetal acceleration | acceleration toward the center of an object by an object moving along a circular path |
| 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 |
| momentum | a property of any moving object; the momentum (p) of an object is the product of its mass and velocity (p=mv) |
| Newton’s second law of motion | describes the acceleration of an object in the direction of the net force applied to it; expressed in equation form as force=mass x acceleration or F=ma |
| Newton’s third law of motion | describes action-reaction pairs; for every action force there is an equal and opposite reaction force |
| projectile | any object shot or thrown through the air; all projectiles have both horizontal and vertical velocities |
| terminal velocity | the greatest velocity reached by a falling object; terminal velocity is achieved when the force of gravity is balanced by air resistance |
| centripetal force | A force acting toward the center of a curved or circular path. |
Created by:
djhockett5
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