Question

Two spherical balls each of mass 1 kg are placed 1m apart. Find the gravitational force of attraction between them.

Answer 1

From Newton's law of Gravitation : gravitational force is directly proportional to product of masses and inversely proportional to square of separation between masses.
e.g., $F=\frac{Gm_1m_2}{r^2}$

here given, $m_1=m_2=1kg$
And r = 1m
we know, G = 6.67 × 10^-11 Nm²/kg²

So, gravitational force , F = 6.67 × 10^-11 × 1²/1²
= 6.67 × 10^-11 N

Hence, gravitational force = 6.67 × 10^-11N

Answer 2

Answer: 6.67x10^-11 kg m/s  (or N)

Explanation:

GIVEN

m1=m2=1kg

we know G = 6.67x10^-11 m^3/kg/s^2

using the formula,

F = GMm/r^2

F= (6.67 x 10^-11 ) (1) (1)/ 1

F=6.67 x 10^-11

the answer is G = 6.67 x 10^-11