Page 237 - New Medley 5 Semester 2

A shovel, axe, adze, board pin, nail, doorstop, teeth and razor are some examples

of wedge.

Wedge being used to split a Shovel Axe Adze
log of wood
Some examples of wedge

Screw

A screw is a simple machine that resembles
a nail with grooves in it. It has a winding

edge with threads. It is actually an inclined
plane wrapped around a rod. It is used

to hold the things together. A screw xes Screw A screw being used to fix
two planks of wood better than a nail. two wooden planks

A screw jack also works on the principle of a screw. e slope of the screw jack

helps li heavy things like cars and trucks easily.

• Understanding

Fill in the blanks.
1. A push or pull is called .

2. ere are types of lever.
3. A pulley helps by the direction of force.

4. A has two inclined planes joined together.

AT ONE GO

 A force can bring change in an object. Force can be of different types.
 A machine is a device that makes our work easier.

 Levers are of three types depending on the position of fulcrum, load and effort.

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