1. Force and Motion
Unit 2

2. Force
A push or a pull

3. Inclined plane
A simple machine that is a flat surface with one end higher than the other

4. Speed
The distance an object moves in a given amount of time

5. Motion
A change in the position of an object as it is moving

6. Friction
A force that slows down a moving object when it rubs against another object

7. Magnet
An object that pulls objects made from iron toward it

8. Pole
One of the two ends of a magnet where the pull is the strongest

9. Attract
To pull toward- unlike poles on a magnet attract each other

10. Repel
To push away-like poles on a magnet repel each other

11. Magnetic Field
All of the invisible magnetic forces around a magnet

12. Gravity
A force that attracts objects to each other. The force of gravity holds you to Earth.

13. Simple Machine A machine that makes work easier
Has few or no moving parts

14. Wedge A simple machine made of two inclined planes joined together
Example: an ax

15. Lever A simple machine made of a bar that moves on a fixed point
Example: a crowbar

16. Pulley A simple machine made up of a wheel with a rope around it
Lifts heavy objects

17. Wheel and Axle
A simple machine made up of a wheel with a rod going through the center
Example: skates, cars

18. Screw A simple machine with ridges or threads that wrap around a rod
Examples: a drill