Simple Machines

1. 1st Class Levers

1.1. A lever in which the fulcrum is positioned between the load and the effort.

1.2. -scissors

1.3. -staple remover

2. 2nd Class Levers

2.1. A lever in which the load lies between the fulcrum and effort.

2.2. -wheel borrow

2.3. -bottle opener

3. 3rd Class Levers

3.1. A lever in which the effort is placed between the fulcrum and the load.

3.2. -a broom

3.3. -a fishing pole

4. Incline Planes

4.1. A slanted surface along with a force moves and object to a different elevation.

4.2. -a slide

4.3. -a ramp

5. Wedge

5.1. A V-shaped object whose sides are two inclined planes sloped toward each other.

5.2. -an axe

5.3. -girl shoes (wedges)

6. Screw

6.1. An inclined plane wrapped around a cylinder.

6.2. -a cap to a jar of peanut butter

6.3. -a light bulb

7. Wheel and Axle

7.1. A simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius.

7.2. -a ferris wheel

7.3. -a bike

8. Pulley

8.1. A simple machine that consists of a rope that fits into a groove in a wheel.

8.2. -a flag pole pulley

8.3. -a crane

9. Work

9.1. The product of distance and force in the direction an object moves.

9.2. Formula: Work = Force x Distance

9.3. Unit: Joules (J)

9.4. -pushing a heavy shopping cart

9.5. -carrying a brief case

10. Power

10.1. The rate of doing work.

10.2. Formula: Power = Work / Time

10.3. Unit: Watts (W)

10.4. -a light bulb

10.5. -a person running

11. Mechanical Advantage

11.1. The number of times that a machine increases an input force.

11.2. Formula: MA = Output Force / Input Force

11.3. Formula: MA = Input Distance / Output Distance

11.4. Unit: no unit

11.5. -a wheel borrow carrying rocks

11.6. -a hammer pulling out a nail