Simple Machines

1. 3rd Class levers

1.1. Third-class levers have the effort placed between the load and the fulcrum.

1.2. A hammer or the human forearm

2. 2nd Class levers

2.1. Second-class levers have the load between the effort and the fulcrum. A wheelbarrow is a second-class lever.

2.2. The wheel’s axle is the fulcrum, the handles take the effort, and the load is placed between them.

3. 1st Class levers

3.1. First-class levers have the fulcrum placed between the load and the effort.

3.2. Crowbars or seasaws/ teetertotter

4. Wheel and Axle

4.1. A wheel and axle has 2 parts to it. The wheel, and the axle!

4.2. Door knobs, rollerblades, or gears in a clock

5. Inclined Plane

5.1. a plane inclined at an angle to the horizontal.

5.2. Ramps or hills

6. Mechanical Advantage

6.1. a measure of the force amplification achieved by using a tool,

6.2. Actual M.A formula: OPF/IPF Imaginary M.A. formula: IPD/OPD

6.3. No units

6.4. rolling a ball up a 2 foot ramp that is 3 feet tall.

7. Power

7.1. `the rate (energy amount per time period) at which work is done or energy converted.

7.2. P=D/T

7.3. Watts(W)

7.4. How much power someone uses to push a box 10 meters in 2 seconds

8. Wedge

8.1. Two inclined planes joined back to back.

8.2. Forks

9. Screw

9.1. A screw is a simple machine made up of another simple machines. It is an inclined plane wrapped around a cylinder.

9.2. Jar lids, fan blades

10. Pully

10.1. A Pulley is a simple machine made up of a wheel and a rope.

10.2. Flag polls

11. Work

11.1. using a force to move an object a distance (when both the force and the motion of the object are in the same direction.)

11.2. Using force to move something

11.3. Formula: W=Fd

11.4. Joules

11.5. pushing a chair across the floor

11.6. Work relates to simple machines by helping us figure out how much work a machine does