Question 15
An apple falls from a tree because of gravitational attraction between the earth and apple. If $F_{1}$ is the magnitude of force exerted by the earth on the apple and $F_{2}$ is the magnitude of force exerted by apple on earth, then

(a) $F_{1}$ is very much greater than $F_{2}$
(b) $F_{2}$ is very much greater than $F_{1}$
(c) $F_{1}$ is only a little greater than $F_{2}$
(d) $F_{1}$ and $F_{2}$ are equal

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Solution

(d) $F_{1}$ and $F_{2}$ are equal

According to Newton’s third law, action and reaction forces are equal

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An apple of mass 100 g falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be $F_{1}$ and the magnitude of force exerted by the apple on the earth be $F_{2}$ , then :
(a) $F_{1}$ is very much greater than $F_{2}$
(b) $F_{2}$ is very much greater than $F_{1}$
(c) $F_{1}$ is only a little greater than $F_{2}$
(d) $F_{1}$ and $F_{2}$ are exactly equal