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

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

Given,

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:

Therefore, the magnitude of gravitational force is 9.8 N