Stars and Galaxies
Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 5, Problem 1RQ
To determine

The name of the Aristotelean natural motion.

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Answer to Problem 1RQ

The name of the Aristotelean natural motion is force of gravity.

Explanation of Solution

According to Aristotle model of universe, earth is situated in the centre of the planetary system.

Since the Earth is situated in the centre of the planetary system, the substances in the earth fall towards the centre of the earth. These motions are known as natural motions.

When an external force is applied to an object, the object will start moving. Also the object will stop eventually, when the external force is zero. This motion is known as violent motion.

Similarly, Aristotle proposed that the earth and water displaced by natural motion; they will come to their place naturally.

This natural motion is also explained by Galileo and Newton for different situation. And they named this force as force of gravity. Thus, due to gravitational force, objects are falling towards the centre of earth. Therefore, the natural force can be regarded as the gravitational force in modern day terms.

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