vocab words

2. an attractive force that exists between all objects that have mass
4. law that states that if the net force acting on an object is zero the motion of the object doesn't change
6. the tendency of an object to resist a change of motion
11. law that states that for every action there is an equal and opposite reaction
13. a principle stating that if the total momentum of a group of objects stays the same unless an outside force acts on the objects
14. a force that one object applies to another object without touching it
16. a push or pull on an object by another object touching it
17. the gravitational force exerted on an object
18. the combination of all the forces acting on an object

1. in circular motion a force that acts perpendicular to the direction of motion toward the center of the curve
3. law that states that the acceleration of an object is equal to the net force exerted on the object
5. the amount of matter in an object
7. the forces two objects apply to each other
8. a measure of how hard it is stop a moving object
9. any motion in which an object is moving along a curved path
10. a contact force that resists the sliding motion of two surfaces that are touching
12. a push or pull on an object
15. forces acting on an object that combine and form a net force of zero