"Consider the earth following its nearly circular orbit about the sun. The earth has a mass mearth=5.98x10^24kg and the sun has mass msu=1.99x10^30kg. They are separated, center to center, by r=93 million miles = 150 million km."(adsbygoogle = window.adsbygoogle || []).push({});

What is the size of the gravitational force acting on the earth due to the sun?

I'm still setting up the problem...

I think I use the equation Fg=G(m1m2 / r2).

r is the distance between the centers of the two objects.

G is the gravitational constant (so I just leave that as G, right?)

But, is the sun or the earth m1?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Understanding Newton's Law of Universal Gravitation

**Physics Forums | Science Articles, Homework Help, Discussion**