
Gears in a machine. Image credit wall.alphacoders.com
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 cstmuseum.techno-science.ca
- 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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