physics

3. an object that is falling under the sole influence of gravity
4. the force exerted on a body by gravity
5. the moving of something from its place or position
8. a fixed point or object in space used to determine the position and motion of another object
9. an amount of space between two things or people.
12. the speed of something in a given direction.
15. the rate of change of position for a time interval which is very small

1. the displacement divided by the time
2. set of axes with reference to which the position is described
6. the rate at which something is able to move
7. the speed of something in a given direction.
10. an assumption, an idea that is proposed for the sake of argument
11. place where someone or something is located
13. a property of matter by which it remains at rest or in unchanging motion unless acted on by some external force
14. a scalar measurement of magnitude or quantity