. What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface

(Mass of the earth is 6×1024 kg and radius of the earth is 6.4 × 106 m).


Best Answer

Ans. Firstly, we will calculate the magnitude of gravitational force by using the formula:

 F = G×  m1 x m2/r2(i)

We know that,

Gravitational constant, G = 6.7 × 10-11 Nm2/kg2


Mass of earth, m1 = 6.4 × 1024 kg

Mass of object, m2 = 1 kg

Distance between centre of earth and object,

Radius of earth, r = 6.4× 106 m

Putting all the values in (i), we get:

centre of earth

Therefore, the magnitude of gravitational force is 9.8 N


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