Simple Machines

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# Simple Machines - PowerPoint PPT Presentation

Simple Machines. What is a Machine?. A machine is a device that helps us perform tasks. How are machines used?. change energy from one form into another transfer forces change the direction of a force change the magnitude of a force change distance or speed. Real simple machines.

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## PowerPoint Slideshow about ' Simple Machines' - tayten

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Presentation Transcript

### Simple Machines

What is a Machine?
• A machine is a device that helps us perform tasks.
How are machines used?
• change energy from one form into another
• transfer forces
• change the direction of a force
• change the magnitude of a force
• change distance or speed
Real simple machines
• 1. State the main function or functions of each of the following machines:
• (a) an axe
• (b) a tennis racket
• (c) a round doorknob
• (d) a screwdriver
• 2. Give two or three examples, of simple machines in the kitchen that increase the force you apply.
Two Families

All machines can be grouped into two categories:

• The Lever Family
• The Inclined Plane Family
Complex machines
• A machine that is composed of two or more simple machines

dL

dE

FL

FE

Fulcrum

Distance to the Effort

(mass) x 9.8

Force of the Effort

First Class Lever

FL

FE

• In a first-class lever, the fulcrum is between the load and the effort force.

Examples include a shovel or pry bar

Second Class Lever

FL

FE

• In a second-class lever, the load is between the fulcrum and the effort force.

Examples include a wheel barrow

Third Class Lever

FL

FE

• In a third-class lever, the effort force is exerted between the fulcrum and the load.

Examples include a fishing rod