Question

gravitational force between two objects of mass 1 kg and 2 kg and separated by distance 1 m is _____​
a) 1N
b) 2G N
c) 2N
d) 1G N​

Answer 1

Answer:

b) 2G N

Explanation:

Gravitational Force = GMm/r^2

Here, M = 1, m = 2, r = 1

So, F = G×1×2/1^2

= 2G N

Answer 2

Answer:

Mass of the bigger body = M = 2 Kg

Mass of the smaller body = m = 1 Kg

Distance between them = r = 1 m

By the gravitational formula:-

Fg = GMm/r² ( Fg = Force of Gravitation)

Fg = G × 2 × 1/1²

Fg = 2G

Fg = 2 × 6.673 × 10-¹¹ N

Note:-

= 'r' is the central distance between the two bodies.

= Here, we are taking both particles as point masses. If we take body whose masses are uniform then this relation will not work.

= For uniformly distributed masses body we use different types of formula.

= The value of 'g' is not constant it varies with depth and altitude. To find a variation with altitude. We have two cases,

If the height of the body is more or near to Radius of earth then we use,

g' = g.R²/(R+h)²

If h<<R

g' = g(1-2h/R) ( h = height and R = Radius of Earth)

To find with depth....

g' = g(1-d/R) ( d = depth and R = Radius of Earth)