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Force
This article on force examines the different types of forces (i) gravitational force (ii) magnetic
force (iii) Frictional force (iv) adhesive force (v) cohesive force and (vi) centripetal force
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Introduction
Force is believed to be a pull or a push of objects
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The SI unit of force is Newton (N)
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1kilograms i
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1kg = 10N
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Move is applied in our everyday life
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ii
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iv
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vi
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One day newton was lying under a mango tree a mango fell; he questioned himself why it did not
go up instead fell down
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This force he said that it is called gravitational force
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Convert the following kilograms into newton:
i
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1000N

If 1kg=10N/kg
1000N= ?
1000 ×1
10
=100Kg

b) Magnetic force
This is a force that is felt when a magnet attracts magnetic materials
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e
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When a magnet is hung freely on the earth, it will
rotate and rest on the direction of North-South direction
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When a north pole is brought close to another north pole of a
different magnet they will repel i
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like poles repel while unlike poles attract
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This gives us the law of magnetism: like poles repel while unlike
poles attract
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It is felt in objects that are moving on one another
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It is applied in walking without sliding, putting on clothes, rubbing
hands together, wear and tear of clothes and soles
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ii
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Greasing
Smoothening rough surfaces
Application of oil (oiling)

Frictional force = apparent force –real force
E
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a man uses 500N when pushing a 20kg load on a rough floor
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Frictional force = apparent force –real force
=500N-(20×10) N
=500-200
=300N
c) Adhesive and cohesive forces
Adhesive force is a force felt when there is attraction between unlike molecules
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For example water wets a glass when poured on it i
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e
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straw

Mercury
The

adhesive force is low compared to
Cohesive force on the level

In the above diagram it is evident that there is greater cohesive force between the molecules of
mercury compared to adhesive force between the straw and the mercury
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It is also felt when objects
move round a corner
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The force that keeps the objects on track without
skidding off is called centripetal force
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These forces are applied in
our daily life through walking, writing using pens and pencils, sweeping, putting on clothes
sharpening of objects among others
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All this force helps human
beings to live comfortable

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