Calculating Force of Gravity in Circular Motion: Formula and Explanation

AI Thread Summary
To calculate the Force of Gravity in circular motion, the relevant formula is F = G(m1*m2)/r^2, where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers. In the context of planetary motion, the centripetal force required for circular motion is provided by gravity, expressed as F = mv^2/r. For Earth orbiting the Sun, the radius is approximately 1.496 x 10^11 meters, and the period is 31,536,000 seconds. The mass of the Sun is about 2 x 10^30 kg, which is essential for calculating gravitational force. Understanding these formulas will help solve for the gravitational force and centripetal acceleration for other planets as well.
Blassemer
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Ok,


How do I go about finding the Force of Gravity(N) in a circular motion problem.

My teacher is asking us to solve for that, so wat do I multiply to get that?

All I need is the formula to find Force of Gravity (N).

PS. I need it pretty quick because the Homework is do tomorrow.


Thanks.
 
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the force of gravity? are you talking about a vertical circular motion?
 
Here is my problem...

It is about the planets and orbiting the sun, this is the planet earth

Radius=1.496x10^11
Period (years) = 1
Period (seconds)=31,536,000
Velocity=2.981x10^4
Centripetal Acceleration-5.94x10^-3
Force of Gravity (N)= ?
Mass (KG)=?
Centipetal Force (N)=?


I actually need to solve for those 3 things, if someone could give me the answer to those then that would be great because I have to do 8 other planets after this one so it would get me off to a good start, Thanks


if not the answer then a formula or something to find them (I really need to know how to find the Force of Gravity (N))
 
The centripetal force (mv^2/r) is supplied by Gravity F=Gmm/r^2

Sun mass = 2 x 10^30 kg if I remember correctly...
 
Adrian Baker said:
The centripetal force (mv^2/r) is supplied by Gravity F=Gmm/r^2

Sun mass = 2 x 10^30 kg if I remember correctly...


So, what does Gmm represent, I know r is radius but wat does Gmm mean
 
Blassemer said:
So, what does Gmm represent, I know r is radius but wat does Gmm mean

Constant of Gravity (NOT 9.8 m/s^2) and m1 and m2, are the masses of the two objects.
 
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