PS+5+-+6th+Period+Brown


 * __The Basics of Motion__**

1.Motion- the change in position of an object with respect to time 2.Reference point- a point used to show movement 3.Relative motion- something moving away from a reference point 4.Distance-the measure of how far an object has moved in relation to a reference point. 5.Displacement- distance and direction of an objects change in position from the starting point 6.Speed- distance an object trevels per unit of time 7.Instantaneous speed- speed of an object at a given point in time 8.Average speed-total distance traveled by total time traveled 9.Velocity- the speed ot the object and its direction10.Direction-the direction something is moving toward 11.Time- a measure of how long an object moves 12.Acceleration- the rate of change of velocity 13.split times- times split up into intervals


 * __Forces__**

1. Force- a push or pull 2. Balanced force- forces on an object that are equal in size and opposite in direction 3. Unbalanced force-two people pushing on a box the greater force is the way the box moves 4. Net force- when two or more forces act on an object at the same time. 5. Inertia- is the tendancy of an object to resist any change in its motion. 6. Mass- amount of matter in an object 7. Law of inertia (newtons first law)- an object moving at a constant velocity keeps moving at that velocity of unless an unbalanced net force acts on it. 8. Newtons second law- the acceleration or an object is in the same direction as the net force on an object 9. F=MA- force equals mass times acceleration 10. Friction- is the force that opposes the sliding motion of two surfaces that are touching each other 11. Static- is the frictional force that prevents two surfaces from sliding past eachother 12. Sliding- is the force that opposes the motion of two surfaces sliding past eachother 13.Rolling- is the frictional force between rolling object and the surface it rolls on. 14.Air resistance- opposes the motion of objects that move through air 15.Terminal velocity- as an object falls the downward force of gravity causes the object to accelerate 16.Law of gravitation- everything that goes up must come down 17.Gravitational force- the force of gravity 18.Gravity- attractive force between two objects that depends on the masses of the objects and the distance between them 19.Newtons second law- the acceleration of an object is in the same direction as the net force on the object and the acceleration equals the net force divided by the mass 20.Inertia- resistance of an object to change in its motion 21.Weight- gravitational force exerted on an object 22.Projectile weight- x/y proportion to motion 23.Centripetal force- a net force that is directed toward the center of a curve 24. Newtons third law- 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 opposite in direction 25.Momentum- property of a moving object that equals mass timeWs velocity 26.Attractive force- the forc__e by whic__h the object attracts another


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