Motion

1. Velocity

1.1. The speed and direction in which an objects moving

1.2. Seed and direction

1.3. A car

2. Friction

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

2.2. Motion that occurs when things slide

2.3. rubbing your hands together to create wormth

3. Force

3.1. A push or a pull

3.2. Pushing and pulling

3.3. Moving a desk

4. Speed

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

4.2. Changing positions

4.3. The speed of a car

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 of existence

5.3. A clock that tells time

6. Velocity

6.1. The speed and direction in which an object is moving

6.2. MOving direction

6.3. Speed

7. Gravity

7.1. The force of attraction between any two objects that have mass

7.2. Two things that have mass

7.3. The earth has gravity and mass

8. Acceleration

8.1. The rate of change and velocity

8.2. Change and velocity

8.3. change

9. Distance

9.1. The length of the path between two points

9.2. Length of two paths

9.3. Lengths