Motion

1. Acceleration

1.1. The rate of change of velocity

1.2. Speed going faster or slower over time

1.3. Drag Racecars

2. Force

2.1. A push or pull

2.2. strength or energy as an attribute of physical action or movement.

2.3. Pushing or pulling open a door

3. Speed

3.1. The rate at which the position of an object changes

3.2. How fast something is going

3.3. Racecars

4. Velocity

4.1. the speed of something in a given direction.

4.2. Speed in a certain way

4.3. Vectors

5. Time

5.1. the indefinite continued progress of existence and events in the past, present, and future regarded as a whole.

5.2. Progress infinite periods

5.3. Clocks

6. Gravity

6.1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

6.2. Forces attracting anything to it's center

6.3. A ball rolling down a hill

7. Distance

7.1. The length of a path between two points

7.2. From point A to B

7.3. Car trips

8. Friction

8.1. A force that opposes motion and that occurs when things slide or roll over each other

8.2. Two items conflicting

8.3. Rubbing your hands together