NS3: Machines

 

Unit 9: Machines

 

      9.1. Simple machines.

      9.2. Making things.

 

9.1. Simple machines.

- There are two types of machines: simple machines and complex machines.

- Simple machines have a few or no moving parts.

- Complex machines are made up of two or more simple machines.

- Some examples are: an inclined plane, a screw, a pulley, a wedge, a Wheel and axle, a lever.

·    An inclined plane.- It moves up and down different levels.

·    A screw.-It holds things together.

·    A pulley.- It lifts heavy objects.

·    A wedge.- It cuts objects.

·    A Wheel and axle.- It moves objects from one place to another.

·    A lever.-It lifts objects.

 

ACTIVITIES

1.-How many types of machines are there?

Simple machines and complex machines.

 

2.- What is a simple machine?

Simple machines have a few or no moving parts.

 3.- What is a complex machine?

Complex machines are made up of two or more simple machines.

4.- Write some examples of simple machines.

An inclined plane, a screw, a pulley, a wedge, a wheel and axle, a lever.

9.2. Making things

- There are simple tools for making things or taking things apart.

- Some examples of simple tools are: a hammer, a screw, a screwdriver, nuts and bolts, a spanner and a saw.

 

·                       A hammer.-It is used for knocking nails.

·    A screw.- It is used for fixing objects together.

·    A screwdriver.- It is used for turning screws.

·    Nuts and bolts .- It is used for holding objects together.

·    A spanner.-It is used for turning bolts.

·    A saw.- It is used dor cutting Wood and other materials.

ACTIVITIES

 

1.- Which are the simple tools?

There are simple tools for making things or taking things apart.

 

2.- List some examples of simple tools.

A hammer, a screw, a screwdriver, nuts and bolts, a spanner and a saw.

 

3.- True or False

- A pulley is a simple machine.     TRUE

- A saw is a complex machine.      FALSE

- A spanner is a simple tool.          TRUE.   

 

 

 

4.- Complete the sentences

 

-      ………… is used to cut wood and other materials.

-      ……………..is used for lifting heavy objects.

 

 5.- Draw

A simple machine

A simple tool.