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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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Presentation Transcript
what is a machine
What is a Machine?
  • A machine is a device that helps us perform tasks.
how are machines used
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
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
Two Families

All machines can be grouped into two categories:

  • The Lever Family
  • The Inclined Plane Family
complex machines
Complex machines
  • A machine that is composed of two or more simple machines
slide11

dL

dE

FL

FE

Load

Fulcrum

Distance to the Effort

Distance to the Load

Force of the Load

(mass) x 9.8

Force of the Effort

first class lever
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
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
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

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