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How to calculate gravity?

How to calculate gravity? - Physics Forum

How to calculate gravity? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 04-23-2012, 05:18 AM
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Default How to calculate gravity?



How to calculate gravity?
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Old 05-10-2012, 01:41 PM
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Default Re: How to calculate gravity?

I'm using the formula F= G*((m1*m2)/r^2)
Since i no the force of gravity is 9.8 m/s on earth, i input earth's mass(5.9742*10^24 kg), my mass(50 kg), and the distance between the earth and me(6.372*10^6 m). The gravitional constant is 6.6742*10^-11 m^3 s^-2 kg^-1, i run the numbers and i end up with 491.0180353 kg m s^-2, not even close the 9.8 m/s, what am i doing wrong?

Thanks in advance,
Calvin
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Old 08-24-2012, 09:32 AM
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Default Re: How to calculate gravity?

Hello friends.
Thanks "Calvin Brave" for nice information.
But i know a formula for calculate gravity.
Use the formula F= G*((m1*m2)/r^2)
Input :
G = 6.6742*10^-11 m^3 s^-2 kg^-1
m1 = 5.9742*10^24 kg
F=m2*g
r=6.372*10^6 m
& get the value of g= 9.8 m/s
I hope that it helps.
Nice to meet you.
Thanks.
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Old 08-29-2012, 08:18 AM
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Default Re: How to calculate gravity?

The units of the universal gravitational constant G, N m^2 kg^-2, N is shorthand for Newtons, the measure of force. m is for metre, kg is for kilogram. The units can sorta be thought as being the way they are due to the units of the other variables in the equation.

F(gravity) is the force due to the gravitation attraction between the two object. G is the universal gravitational constant. m1 and m2 are the masses of the two objects between which the gravity is acting (for example, between the earth and your body). r is the distance separation between the two objects (notice that earth pulls on you much more then saturn does, despite saturn's much larger mass!) .
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