Homework Help: Physics

Posted by Lynn on Sunday, May 4, 2008 at 7:15pm.

In calculating the force of gravity between two objects, if the mass of one objects increased by 4 and the other by 2, how many times would the force of gravity increase?
Ok well Im horrible at physics but the way I understood it was that you would take 4 times 2 then divide by 2 which would be 8/2= 4. So four would be the answer?

In calculating the force of gravity between two objects, if the distance between the objects is increased by 4 times, the force of gravity will....

I think its increase by 1/4.

If either of these are wrong can someone at least give me the formulas explained in words so I can retry and repost.

Physics - Doug, Sunday, May 4, 2008 at 8:19pm
Force of gravity= gravitational constant x Mass1 x Mass2 /r^2 so if Mass1 increases by 4 and the other by 2 then it would increase by 8.

Between 2 objects,
Inverse Square Law: Gravity at A = gravity at B × (distance B / distance A)2

It would be (1/4)^2 or 1/16

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