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# Simple Machines - PowerPoint PPT Presentation

Simple Machines. Inclined Plane. Flat, sloped surface Multiplies force (you input less force over a larger distance) Example: Ramp IMA: length / height. Wedge. An inclined plane (or 2 back to back) that can move… thick at one end and tapers to a thin edge at the other end

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## PowerPoint Slideshow about ' Simple Machines' - vahe

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Presentation Transcript

### Simple Machines

Flat, sloped surface

Multiplies force (you input less force over a larger distance)

Example: Ramp

IMA: length / height

An inclined plane (or 2 back to back) that can move… thick at one end and tapers to a thin edge at the other end

Changes direction of the force (can also multiply force)

Examples: axe, zipper, knife, teeth…

An inclined plane wrapped around a cylinder

Multiples force (you input less force over a larger distance), can also change the direction of the force

Examples: screw, bottle cap (lid), curving parking ramp or road curving around a hill or mountain

A rigid bar that pivots on a central point called a fulcrum.

IMA: distance from effort to fulcrum

• Three types of lever: 1st class, 2nd class and 3rd class. (pictures of the different lever set ups are on the last 3 slides)

• How levers make work easier depends on which class lever is being used.

• 1st class: changes direction, can multiply force or distance

• 2nd class: multiplies force

• 3rd class: multiplies distance

Input force

Output force

Fulcrum

Input force

Output force

Fulcrum

Output force

Input force

Fulcrum

1st class: Seesaw, scissors, pliers neck

2nd class: wheelbarrow, door, nutcracker, bottle opener, foot

3rd class: hockey stick, shovel, baseball bat, arm

2 circular objects fastened together that rotate around a common axis. The circle with the larger radius is the wheel

If input is turning the wheel: multiplies force

If input is turning the axle: multiplies distance

Examples: Steering wheel, screw driver, door knob

Made of a grooved wheel with a rope or cable wrapped around it.

Can be fixed, movable or block and tackle

IMA: number of segments of rope that support the load

Can change direction and can multiply force

Examples are found on:

flag poles, sail boats,

construction cranes