Unit 1 Terms

3. forces equal forces acting on an object in opposite directions (no motion)
5. point a place or object used for comparison to determine if an object is in motion
7. Friction occurs when two objects slide over each other. Example: sand on an icy sidewalk to improve footing, rubber brake pads rubbing on tire rim to slow a bike.
8. this is a vector quantity that describes how far an object moves from its original position
9. the amount of space or length between two points or objects
11. third law for every action, there is an equal and opposite reaction
13. the product of an objects mass and velocity
14. the force that one surface exerts on another surface when the surfaces come into contact with each another.
16. the force that pulls all object towards each other.
17. the state in which ones object's distance from another object is getting closer or further apart
18. the distance an object travels per unit of time
20. friction comes into play when a body is forced to move along a surface but movement does not start (no motion)

1. a push or a pull exerted on an object
2. forces forces that produce a nonzero net force,which changes an objects motion (motion)
4. when a moving object increases speed, decreases speed or changes direction
6. the force that one surface exerts on another surface when the surfaces come into contact with each other
10. speed in a given direction(speed with a direction)
12. speed the overall rate of speed at which an object travels or moves;calculated by dividing the total distance an object travels by the total time.
15. First Law (Inertia) an object at rest stays at rest and an object in motion stays in motion with the same velocity and in the same direction unless acted upon by an unbalanced force.
19. force determines if an object moves and in which direction