Physics

1. Capacity to do work or produce heat.
8. Product of an object's mass and velocity.
9. Study of light and its behavior.
10. Study of relationships between heat, work, temperature, and energy transfer.
12. Push or pull on an object resulting from interaction with another object.
14. Central part of an atom containing protons and neutrons.
18. Tendency of an object to resist changes in its motion.
19. Relating to motion.
20. Disturbance that travels through space and matter.

2. Attractive force between two objects with mass.
3. Attraction or repulsion of objects with magnetic fields.
4. Elementary particle representing a quantum of light or other electromagnetic radiation.
5. Speed of an object in a particular direction.
6. Rate of change of velocity of an object.
7. Change in position or location of an object.
11. Basic unit of matter.
13. Force resisting the relative motion of solid surfaces.
15. Flow of electric charge.
16. Tiny piece of matter.
17. Amount of matter in an object.