Unit 2 Vocab

1. a force that exists between all objects that have mass
7. forces acting on an object that combine and make a net force of zero (two words)
10. the amount of matter in an object
12. any motion in which an object moves along a circular path (two words)
15. a force that on object applies to another without touching it (two words)
17. the gravitational force exerted on an object
18. a principle stating that the total momentum of a group of objects stays the same unless outside forces act on the objects (two words) (its a law)

2. law that states that for every action there is an equal opposite reaction (two words)
3. a measure to find how hard it is to stop a moving object
4. the forces two objects apply to each other (two words)
5. The law that states that the acceleration of an object is equal to the net force exerted on the object divided by the object's mass (two words)
6. a push or pull on an object
8. a push or pull on one object by another object that is touching it (two words)
9. the combination of all the forces acting on an object (two words)
11. the tendency of an object to resist a change in its motion
13. in circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve (two words)
14. a contact force that resists the sliding motion of two objects
16. the law that states that if the net force acting on an object is zero,the motion of the object dos not change (two words)