Work and Energy

4. Force produced when two substances work against each other
5. Displacement in the direction of an applied force is a result of this
6. A statement that explains the force needed to extend or compress a spring by some distance, is directly related to that distance
8. The product of the force acting on a body and the time interval during which the force is exerted
12. Energy cannot be created or destroyed, but remains constant.
14. Unit used to describe the weight of an object
15. An object or material able to return to its natural state even after distortion

1. The result of unbalanced forces
2. Momentum is conserved before and after a collision
3. A system that does not interact with its surroundings, as its total energy and mass stay constant.
7. The force that attracts a body toward the center of the earth
9. The amount of an energy an object has relative to its mass and displacement
10. The motion of a moving object, with respect to its mass and velocity.
11. The resistance to the change in movement, or lack thereof
13. For every force, there is a force equal to but opposite in direction