Gears in a machine. Image credit

Gears in a machine. Image credit

ZIMSEC O Level Combined Science Notes: Machines

  • A machine is a device that makes work easier either by:
  • Reducing the effort (force) required to lift the load or
  • By changing the direction in which the effort is applied
  • Machines enable humans to accomplish tasks that would otherwise be impossible
Basic machines. Image credit

Basic machines. Image credit

  • Basic machines include:
  • Levers
  • Pulleys
  • Inclined planes
  • Gears
  • and the wheel and axle
  • More complex machines are built from a combination of these simple machines
  • For example :
  • A car combines basic machines such as wheels, axle,gears and levers
  • Machines are a part of everyday human life
  • Examples of more complex machines are:
  • Cars
  • Bicycles
  • Wheelbarrows etc

To access more topics go to the Combined Science Notes page

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