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Gravity.

A basic explanation is that anything in the universe that has mass (all matter and substances) create a gravitational field that is always attractive never repulsive. Everything attracts everything else in such a way as if the field was coming from the centre of the object.

The strength of the field depends on the mass (how much 'stuff' there is) and the distance the objects are apart. The more mass there is the greater the field it makes. Double the mass you double the field strength. (If the distance apart remains the same)

However the distance apart works in the opposite way, but the strength drops off more quickly by what is called the inverse square of the distance. Which means if you double the distance apart you reduce the field by four times or to only a quarter of the original strength.

The field spreads out equally in all directions from the centre, so as far as the field is concerned 'down' is always to the centre of the object or mass.

When the object is spinning there is the centripetal and centrifugal forces trying to throw you off. If the spinning speed is fast enough to overcome gravity you will be thrown off, if the speed is not great enough you, and everything else, remain firmly on the ground.

This is the case with the earth and all other planets.

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13y ago

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