Forces and Motion

3. the amount of matter in an object
5. Speed in a given direction
7. The tendency of an object to resist any change in its motion.
8. friction friction that occurs when one solid surface slides over another
10. The distance an object travels per unit of time. Distance divided by time.
14. force The electromagnetic force is the force that causes an attraction between electrons and the positive nucleus. All forces between atoms are caused by electromagnetic force.
15. force The combination of all forces acting on an object
16. second law-Force equals mass times acceleration
18. An object's change in position relative to a reference point.

1. A force of attraction between objects that is due to their masses.
2. The rate at which velocity changes
4. A push or a pull
5. A quantity that has both size and direction.
6. of momentum-the total momentum of a system of objects does not change, as long as no outside forces are acting on that system
9. A measure of the force of gravity on an object
11. first law-An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
12. third law-For every action there is an equal and opposite reaction
13. friction A force of attraction between objects that is due to their masses.friction that occurs when an object rolls over a surface
17. friction Friction that acts on objects that are not moving