Rollercoasters are pulled downwards by the Earth's gravity.Gravity is an invisible force that attracts objects to one another. Every object in the Universe, from a pen to a planet, has gravity, but bigger objects have more gravity than smaller ones. Every time you jump up in the air, you fall back down to Earth again. This is because the Earth’s gravity is pulling you towards it.
Gravity is responsible for the tides. The rise and fall of sea levels are caused by the combined effects of the gravitational forces exerted by the Sun and Moon.
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