1. PHYSICAL SCIENCE SIMPLE MACHINES Abney Elementary

2.  A basic machine that makes up other machines is called a simple machine.

3.  Efficiency is how well a machine changes effort into useful work.

4.  A lever is a bar that turns on a fixed point called a fulcrum. (Examples: pry bar, pliers, scissors, see- saw)

5.  The effort force is the force used when you push or pull a lever.

6.  A pulley is made up of a rope or chain and a wheel around which the rope fits.

7.  A pulley that stays in the same place is called a fixed pulley. Fixed pulleys are often used to raise and lower something lightweight such as a flag.

8.  Multiple pulleys are used to move heavy loads.

9.  A wheel and axle is made up of a large wheel attached to a smaller wheel or rod.

10.  Examples of a wheel and axle are a door knob, a fishing reel, and a wheel on a wheelchair.

11.  Wrapping an inclined plane around a pole makes a screw

12.  Turning a screw moves things up a spiral ramp.

13.  An inclined plane is a flat surface that has one end higher than the other. (Example: a ramp)

14.  The effort force of an inclined plane is applied upward along the plane.

15.  An inclined plane makes work easier by decreasing the force needed to lift an object.

16.  Two inclined planes placed back to back form a wedge. (Example: the blade of an ax)

17.  A wedge pushes things apart while a ramp lifts things.

18.  Some machines are made up of different kinds of simple machines.

19. THE END