1.
A place or object used for comparison to determine if something is in motion.
2.
The distance an object travels in a certain time.
3.
The speed of an object in a certain direction.
4.
The rate of change of position.
5.
Change in velocity divided by the time it takes to occur.
6.
The force of to surfaces against each other.
7.
The force that keeps us on earth.
8.
The tendency of an object to resist any change in it's motion.
