Universal systems and simple machines

Four factors in universal system model

1. Input

2. Process

3. Output

4. Feedback

Work=

Force x Distance

Simple machines don’t reduce amount of work

They use less force over a longer distance

Lever

Something similar to a seesaw that can lift an object

Inclined plane

something that can hold things together or lift an object

wedge

something that can split an object apart

Screw

something that can hold things together or lift an object

wheel and axle

made of two cylindrical objects fastened together that rotate about a common axis

Mechanical advantage

How many times a machine multiplies your force

MA=

output force / input force

wheelbarrow

lever and wheel

crowbar

lever and wedge

scale

lever