Find gravitational force

  • #1

Homework Statement


what is the gravitational force acting on a person due to another person standing 2 meters away? assume each individual has 59kg mass.


Homework Equations


looks like i tried to use w=mgy
but that was wrong.
with that you get like 1156.4

The Attempt at a Solution


the answer is 5.8*10^-8N but idk how to get it
 

Answers and Replies

  • #2
Doc Al
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Look up Newton's law of universal gravity. (W = mg is the weight of a body near the earth's surface--the gravitational attraction between the earth and the body. You want the force between the two bodies.)
 
  • #3
so Fg=G* (m1m2)/r^2 is g 9.8 or fg?
 
  • #4
Doc Al
Mentor
45,051
1,364
so Fg=G* (m1m2)/r^2
That's the correct equation. But there's no 'g' in that equation. What you need is the gravitational constant G. (Look it up.)
 
  • #5
its 6.673*10^-11 thanks i got it now
 

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