Simple Machines.

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Presentation transcript:

Simple Machines

Objectives 1. Name and describe the six types of simple machines. 2. What determines the mechanical advantage of different types of simple machines? 3. Recognize simple machines within compound machines.

Simple Machines - all complex machines are composed of combinations of these. Lever Family Simple lever Pulley Wheel and axle Inclined Plane Family Simple inclined plane Wedge Screw

Hammer

Pulleys

Pulley IMA Is equal to the number of rope segments supporting the load

Wheel & Axle IMA Is found by dividing the radius of the wheel by the radius of the axle.

Inclined Planes

An inclined plane Reduces the effort force by increasing the distance through which the force is applied.

Wedge

Screw An 87.5 kg nut and bolt, one of sixteen used to join sections of the generator shaft of a 75000 kW generator at Grand Coulee Dam in 1942

A screw With closely spaced threads has a greater IMA than a screw with threads spaced farther apart.

Three Classes of Levers 1st Class 2nd Class 3rd Class

Mechanical Advantages of Levers 1st class can be < = or > 1 Seesaw, scissors, tongs 2nd class is always > 1 wheelbarrow 3rd class is always < 1 Baseball bat, hockey sticks, golf clubs

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