Transcript
MACHINES
Machines are objects we use to make work easier.
All machines use energy:•from people (screwdriver, wheelbarrow…)•electrical (microwave, washing machine…)
•from water (watermills…)•from wind (windmills…)
Uses:• to apply force.
•to transport things.•to heat or cool things.
•to communicate.•to process information.
SIMPLE MACHINES•They have one part or just a few parts.•They use energy from people to work.
The pulley The leverThe inclined plane
The pulley:•We use it to lift and lower heavy objects.
•It has got an axle.
The inclined plane:•It is a ramp.
•We use it to move heavy things up or down.
The lever:•It is a rigid bar.
•It has got a pivot point.•We use it to lift heavy objects.
COMPLEX MACHINESThey are made up of many operating parts.
A bike is a complex machine. It has got two pedals, a handle bar, two
wheels, teeth, gear and a chain.
Look at these machines.
•What are their names?•Are they simple or
complex machines?
•We use them to…
• to apply force.•to transport things.•to heat or cool things.•to communicate.•to process information.
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