SCIENCE 3 - UNIT 9 - MACHINES

SCIENCE 3. UNIT 9

MACHINES

Page 126.

1st Copy and complete the sentences.

a. An inclined plane is used to move objects up and down different levels.

b. A lever uses a rigid bar and a fulcrum to lift objects.

c. A pulley uses a rope and a wheel to lift heavy objects.

d. A screw is an inclined plane around a shaft.

Page 127.

2^nd Find an example of a pulley in your classroom.

An example of a pulley in my classroom is the blinds.

3^rd Identify the simple machines that make up a pair of scissors.

A pair of scissors is made up of two levers and two wedges.

Page 128.

1^st Which tool do we use to turn screws? And bolts?

We use a screwdriver to turn screws.

We use a spanner to turn bolts.

Page 132.

1^st Copy and complete.

Machines can be		Tools
simple	complex
are made up of few or no moving parts	are made up of simple machines	help us make things and take things apart
wheel and axle screw pulley inclined plane lever and fulcrum wedge	computer lorry car TV phone bicycle clock watch	screwdriver spanner nuts and bolts hammer saw screws

Page 133.

1^st Identify the simple machines in the picture.

A. a pulley

B. an inclined plane

C. a wedge

2^nd Copy and complete the sentences.

a. Simple machines have few or no moving parts. When you put them together you get a complex machine.

b. We can use a pulley to lift a heavy box up to a high window.

c. We can use a screw to attach the legs to a table.

3^rd Look at the pictures and say which tools you need to complete the job.

A. a spanner

B. a screwdriver

C. a saw