Question

An apple falls from a tree. An insect in the apple finds that the earth is falling towards it with an acceleration g. Who exerts the force needed to accelerate the earth with this acceleration?

Answer 1

Answer:

the insect

Explanation:

Since the earth is not actually moving towards the apple, it is the insect which is assuming it.

The insect views the earth's acceleration as g towards it as the apple is moving with acceleration g

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Answer 2

THANKS FOR THE QUESTION

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=> the mutual gravitational force between the apple and the earth is responsible for the acceleration produced in the Apple falling from the tree.

=> Alto the rest will experience the same force, does not get attracted towards the Apple because of its large mass.

=> the insect fields that the Earth is falling towards the Apple with an acceleration 'g' because of the relative motion.

let,

Vae = velocity of the Apple w. r. t earth

Vea = velocity of the earth w. r. t apple

Vae =Va - Ve = -(Ve-Va) = -Vea

=>As insect is in the frame of Apple so it seems the earth moving in a relative velocity Vea.

=>Any other observer on earth will see the Apple is moving towards the earth with velocity Vae.

=>both are opposite in direction.