# 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).

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

F = G× (i)

We know that,

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

Given,

Mass of earth, m1 = 6.4 × 1024 kg

Mass of object, m2 = 1kg

Distance between centre of earth and object=Radius of earth, r = 6.4× 106 m

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

F = = 9.8144 N

Therefore, the magnitude of gravitational force is 9.8144 N

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