When I am solving for the force of gravity between two objects...(con't.)?

I would take the mass of two objects in kilograms (what do I use if they are less than that) multiply them with another then divide by the distance squared, between the two (do I factor in other forces of gravity as well or is that already assumed) and multiply by 6.67x ten to the negative 11th to...get something in newtons? Yet isn't the equation for newtons F = M * A... Is this Just a lack of understanding because I have so many questions? I mean kilograms is a relative term so is there a ratio for the change of it's value considering anywhere outside of earths gravitational field or would I just put in the distance for that ratio....aghhhhhhh. Please help me...Don't send me to wikipedia either.

over 13 years ago

Physics

6 replies

kaety

over 13 years ago

"F= ma is not relevant at this point. F = GMm / R^2 is discovered to be the gravitational force between any two bodies. There ARE no other forces of gravity. This is the amount of attraction between these two bodies irrespective of any other gravitational forces that also exist. kilograms is not a relative term. The constant G = 6.67 * 10 ^ -11 is found experimentally. The value is only true if you use masses measured in kg and distances measured in m. If you wished to use other units then you would also need to establish the appropriate constant for those other units. And that is too much like hard work. Quite needlessly too. Even if the masses are far smaller than 1 kg the masses must still be measured in kg to use the constant specified. NOW let us add in F = ma but F ALSO = GMm/ R^2 so ma = GMm/ R^2 a = GM/ R^2 i.e the acceleration caused by gravity has this value. We normally use the symbol ""g"" for this special acceleration. But it still represents an acceleration anyway."

pamelaaaa

about 13 years ago

Utilized in talk to cut back your force out of an declaration or even view, or even with good grace suggest as well as turn down one thing

to see other 4 answers

Does gravity force cancel normal force?

Gravity formula is F = Gmm/r^2. now if you have two objects say 5kg and 10kg and attach them its like r = 0.000001 (m) right? so does that mean they pull each other at F=5*10*6.67*10^-11/10^-11 = 333,500(N)??? and why do objects tend to fall away from each other if they are not glued then?? its an incredibly strong force omg someone explain it to me im so confused

myfuture

over 13 years ago

Aerospace Engineering

How to measure the force of gravity ?

If two objects was 5m then became 25m apart, what would the force of gravity between them be? And how did you find it?

agrata

over 13 years ago

Aerospace Engineering

Couldnt gravity be explained by chemistry?

Interactions between charged particles. Attracting and repellling one another. Stronger force near the center of a mass because there and more particles is a smaller space. More dense materials at the centrr. Is the force that holds the universe in place not the same force that holds our bodies and everything else together? Why not

edmond

about 13 years ago

Material Engineering

"Compared to the force of gravity, the electrostatic force on an electron by a proton in a hydrogen atom."

My stupid teacher insulted me infront of my whole class when I asked her to revise the solution to this question.

blueeyes_11

over 13 years ago

Physics

"The sum of the kinetic and potential energies of a system of objects is conserved: "

"A. only when no external force acts on the objects B. only when the objects move along closed paths C. only when the work done by the resultant external force is zero D. always E. none of the above"