Gravitational Forces

Science — First Preparatory

Applications and examples from life

Comparison aspect	Main idea	Keywords
Falling objects	objects fall towards the Earth because of gravity. Without air resistance an iron ball and a wooden ball dropped from the same height reach the ground at about the same time even though their masses differ	towardsEarthbecausegravity
Tides	the Moon’s gravity raises and lowers the sea level. The water facing the Moon is pulled more strongly than the water on the far side of the Earth	Moongravityraiseslowers
Artificial satellites	satellites orbit the Earth because the Earth’s gravity keeps pulling them towards its centre. This changes their direction of motion so they do not move away in a straight line	orbitEarthbecausegravity

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