02-02-2020
Chemistry

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What is the centripetal Force that keeps satellites such as the moon in orbit around the sun

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skyluke89 skyluke89

09-02-2020

The centripetal force between a satellite and a planet (or a planet and the Sun) is given by the gravitational force

Explanation:

When an object is in circular motion, the velocity of the object constantly changes (at least its direction): this means there is an acceleration acting on the object, and therefore there must be a force.

This force is called centripetal force, and it is always directed towards the centre of the circular trajectory.

The nature of this centripetal force depends on the situation: in fact, different forces can act as centripetal forces. For instance:

For a car moving along a turn on the road, the centripetal force is provided by the force of friction between the tires and the road itself
For a satellite moving around a planet, such as a moon, or for a planet moving around a star, the centripetal force is provided by the force of gravitational attraction between the two objects.

Learn more about circular motion:

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