Unit 7 machines
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UNIT 7. MACHINES AND INVENTIONS 1. MACHINES AND ENERGY
Transcript of Unit 7 machines
UNIT 7. MACHINES AND INVENTIONS
1. MACHINES AND ENERGY
A machine is an instrument that
makes work easier
There are two types of machines:
Simple machines
Complex machines
SIMPLE MACHINES
• Simple machines are called tools and they don’t have many parts.
They often have one or two parts
PLIERS are simple machines
A SCREWDRIVER is a simple machine
A BOTTLE OPENER is a simple machine
A PENCIL SHARPENER is a simple machine
A HAMMER is a simple machine
complex MACHINES
Complex machines have many parts.
They have more than two parts.
A WASHING MACHINE is a complex machine
An ELECTRIC SCREWDRIVER is a complex machine.
A WATCH is a complex machine
A BICYCLE is a complex machine
ALL MACHINES NEED
ENERGY TO WORK.
Most machines that help us move burn
fuels
A car A planeA bus
need fuel
Other machines use electricity
A hairdryer
An electric drill
need electricity
Some machines use human energy
A stapler scissors
need energy from people
Some machines use energy from the…
sun wind water
They produce very little pollution.
