# What is meant by universal gravitational constant?

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science
physics

n (physics) the

**universal constant**relating force to mass and distance in Newton's law of**gravitation**. Synonyms: G,**constant**of**gravitation**,**gravitational constant**Type of:**constant**. a number representing a quantity assumed to have a fixed value in a specified mathematical context.

Simply so, what is the value of G?

9.8 m/s^{2}

**gravitation**, F = G M 1 M 2 d 2 , where F is the

**gravitational**force between two point masses, M

_{1}and M

_{2}; d is the distance between M

_{1}and M

_{2}; G is the

**universal gravitational constant**, usually taken as 6.670 × 10

^{11}m

^{3}/(kg)(s

^{2}) or 6.670 × 10

^{−}

^{8}in centimeter–gram–second units.

Also to know is, what does 9.81 mean?

It **means**, for acceleration of **9.81** (m/s^2), the velocity will increase by **9.81** meter/sec. It **means**, if you let a body fall freely (on earth), then this is the rate at which it will gain in speed towards the ground. It's called the acceleration due to gravity.

**g** =Gravity of Earth. **S.I Unit of g** is m/sec -Metre per second. If in newton it is N/Kg -newton per kilogrammes..