A classical mechanics problem by Enchant Slush

Classical Mechanics Level 1

Consider a system containing two massive particles P1 and P2 kept at a distance 'd' from each other. Statement: The gravitational force applied by a particle P1 on P2 is equal to the gravitational force applied by P2 on P1 Now, consider P1 as an apple hanging on a tree and P2 as our earth. .. The gravitational force F applied by earth on apple attracts the apple towards earth and hence, the apple falls down. But, according to statement, apple also applies a gravitational force F on earth. Then why is the earth not getting attracted to the apple? .

The trunk of the tree stops earth from getting attracted to the apple. As mass of earth tends to infinity, formula of acceleration becomes a=F/infinity => a=0 Earth itself attracts other objects with its gravity. Why does it get attracted to other objects? Cannot say

Enchant Slush by Enchant Slush , 21, India

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1 solution

An apple is so much less massive than Earth, so its effects are negligible go unnoticed. The forces of attraction will be equal and opposite. However, you must take inertia into account. The inertia of the Earth is very great, but the inertia of the apple is small. The force is strong enough to move the apple, but not strong enough to noticeably move the Earth.

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