Page 34 - Science Class 6 Times Publication

3. Simple machines transfer force from one point to another
Have you ever opened the lid of a can ? How do you open it ?

Can you open the lid of the can with your ngers only ?
The answer is probably ‘no’. But you can easily open the lid if you use
the long stem of a spoon or a knife.

A

B

In the gure, effort (force) is applied in the lid of the can at point ‘A’
of the spoon but the spoon opens the lid of the can at point ‘B’. Here,
the force is transferred from point ‘A’ to ‘B’ of the spoon.

4. Simple machines change the direction of the applied force
A pulley can be used to lift heavy objects.
It can also be used to draw water from Wooden disk
a well. If you pull the rope of the pulley
downwards, the bucket will be pulled Rope
upwards. In this case, the direction of the
force is changed by the pulley. Thus, the L
simple machine makes our work easier E
by changing the direction of the applied
force.

Types of simple machines

The simple machines can be classied into six types on the basis of
structure and function. They are:

1. Lever 2. Pulley
3. Wheel and axle 4. Inclined plane

5. Screw 6. Wedge

Times' Crucial Science and Environment 30 Book 6