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WEEK FIVE
TOPIC: FORCE
SUB-TOPIC: GRAVITATION AND WEIGHTLESSNESS
Meaning of gravitation:
Gravitation is a type of force that acts on a body across a distance, without any contact between the source and the body.
The earth exerts a gravitational force on bodies by which it pulls these bodies towards its centre. This is why fruits fall to the ground from the tree and do not rise upwards. Also, when a stone is thrown upwards it soon stops its upward movement and starts to fall back to the earth.
The force of gravity is a universal force. It exists between the earth and bodies and between planets and stars.
Gravitational pull determines the weight of objects.
The amount of force with which gravity pulls an object depends on three things:
iii. The distance between the centre of the object and the earth.
Effect of gravitation on objects:
WEIGHTLESSNESS:
The term weightlessness is described as
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