Simple Machines. Definitions Simple machine—A machine that makes work easier by multiplying a...

Simple Machines

Definitions

• Simple machine—A machine that makes work easier by multiplying a force or changing the direction of a force

• Effort– work put into a machine also know as work in or win

• Load—work done by the machine, also know as work out or wout

• Mechanical Advantage (MA)—Force out/force in• Efficiency=(Work out/work in) * 100%

Simple machines

• Simple machines do a lot of things, but one thing they never do is multiply work. Why is that?

• A compound machine occurs when you put more than one simple machine together.

Levers 1st class

Levers 1st class

Lever 2nd class

Lever 2nd class

Lever 3rd class

Lever 3rd class

What advantages does this type of lever have?

Levers in Action

• How a backhoe works

Lever --Wheel and Axle

Lever --Wheel and Axle

Lever --Pulley

Lever --Pulley

Inclined plane

• Ramp• Screw • Wedge

Lever Ramp

Inclined Plane --Ramp

Inclined plane --Screw

Inclined plane --Screw

Inclined plane --wedge

Inclined plane --wedge

Wedge—Hull Design