| Down |
|---|
| 2. | if no net force acts on a system, then the total momentum of the system does not change. (6 Words) |
| 3. | a force that opposes the motion of objects that touch as they move past each other. |
| 5. | a measure of the inertia of an object and depends on the amount of matter the object contains. |
| 6. | a force that acts between any two masses. |
| 7. | the motion of a falling object after it is given an initial forward velocity. (2 Words) |
| 9. | a center directed force that continuously changes the direction of an object to make it move around the center. (2 Words) |
| 11. | an attractive force that acts only over a short range. (3 Words) |
| 12. | an attractive force that acts between any two masses. (2 Words) |
| 14. | a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together. (3 Words) |
| 15. | the force of gravity acting on an object. (W=mg) (9.8m/s) |
| 16. | a force that opposes the direction of motion of an object as it slides over a surface. (2 Words) |
| 17. | the friction force that acts on objects that are not moving. Static friction always acts in the direction opposite to that of the applied force. (2 Words) |
| 18. | the force that causes a 1 kilogram mass to accelerate at a rate of 1 meter per second each second. |
