# Answer the following question. What do you mean by gravitational constant? State its SI units. - Physics

Short Note

What do you mean by a gravitational constant? State its SI units.

#### Solution

1. From Newton’s law of gravitation,
F = G("m"_1"m"_2)/"r"^2
where, G = constant called universal gravitational constant. Its value is 6.67 × 10-11 N m2/kg2.
2. G = "Fr"^2/("m"_1"m"_2)
If m1 = m2 = 1 kg, r = 1 m then F = G.
Hence, the universal gravitational constant is the force of gravitation between two particles of unit mass separated by unit distance.
3. Unit: N m2/kg2 in SI system.
Concept: Universal Law of Gravitation
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#### APPEARS IN

Balbharati Physics 11th Standard Maharashtra State Board
Chapter 5 Gravitation
Exercises | Q 2. (xiii) | Page 97