chapter 2 vocab

3. forces acting on an object that combine and form a net force that is not zero
5. in circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve
6. the amount of matter in an object
7. the tendency of an object to resist a change in its motion
10. forces acting on an object that combine and form a net force of zero
11. a push or a pull on one object by another that is touching it
12. an attractive force that exists between all objects that have mass
13. a force that resists the motion of two surfaces that are touching
14. if the net force on an object is zero, the motion of the object does not change
16. the combination of all the forces acting on an object
17. the forces two objects apply to each other
18. a force that one object can apply to another object without touching it

1. any motion in which an object is moving along a curved path
2. the gravitational force exerted on an object
4. the total momentum of a group of a group of objects stays the same unless outside forces act on the objects
6. a measure of how hard it is to stop a moving object
8. the acceleration of an object is equal to the net force acting on the object divided by the object's mass
9. when one object exerts a force on the second object, the second object exerts an equal force in the opposite direction of the first second object
15. a push or a pull on an object