Machines & Efficiency.

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Presentation transcript:

Machines & Efficiency

Simple Machines In your notebook write down 5 machines you saw on your way to school today.

The 6 Simple Machines Lever

The 6 Simple Machines Pulley

The 6 Simple Machines Inclined Plane

The 6 Simple Machines Screw

The 6 Simple Machines Wedge

The 6 Simple Machines Wheel and Axle

Why do we need simple machines? Machines DO NOT reduce the amount of work. Work = Fd

Why do we need simple machines? W= Fd input output

Why do we need simple machines? Machines make work easier by changing the size or direction of the force.

The Inclined Plane Force distance

Levers Three parts to a lever: Load (output) Force (input) Fulcrum: support or balance

A seesaw is a lever The fulcrum acts as a pivot point, allowing the lever to rotate.

Three Lever Classes 1st Class Lever Input Output F

Three Lever Classes 2nd Class Lever Output Input F

Three Lever Classes 3rd Class Lever Output Input F

Three Lever Classes 2nd Class Lever Input Output F

Three Lever Classes 3rd Class Lever F Input Output

Three Lever Classes 1st Class Lever Input Output F

Mechanical Advantage MA = Fo = Li Fi Lo

Pulleys By adding rope you decrease the input force needed to achieve the same amount of work

Mechanical Efficiency Eff = _Wo_ X 100 Wi Never more than 100%

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