motion

1. Friction

1.1. A force that occurs when things slide or roll over each other

1.1.1. a force that happens when things slide or roll over eachother

1.1.1.1. car doing a doughnuts

2. Acceleration

2.1. the rate of change of velocity

2.1.1. the rate that changes velocity

2.1.1.1. car increasing speed

3. Speed

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

3.1.1. the rate that the position of an object changes

3.1.1.1. NASA car

4. Distance

4.1. the length of the path between two points

4.1.1. the length of the path that's in between the two points

5. Time

5.1. the amount of time that passes from one event to another

5.1.1. the amount of time that goes from one place to another

5.1.1.1. a clock?

6. Velocity

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

6.1.1. The direction and speed that an object is moving

6.1.1.1. vectors

7. Gravity

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

7.1.1. the force of attraction between any two things that have mass

7.1.1.1. a apple falling from a tree

8. Force

8.1. a push or pull

8.1.1. a pull or a psh

8.1.1.1. pushing car