Trying to figure out gravitational attraction between two objects.

[LuigiHomer]

Trying to figure out the gravitational attraction between two objects using Newton's Law of Universal Gravity.Need to figure out what the force is.Here is a model.If anything is in ordinary parentheses then it is an exponent.

----------------------G
--------____________|_____________400x300
F1=F2=[6.673x10(-11)N m(2) kg (-2)] -----
-------------------------------------2,000(2)






Force is proportional to the product of the two masses{120,000}and inversely proportional to square of distance between two point masses.{4,000,000}




Please help me figure out what F1 is,since F1 is equal to F2.

-LH

 

[DaveC426913]

First thing you must do is ensure all your numbers are in the right units: kilograms & metres (since those are the units that G is in). I don't know what units your numnber are in now.

F - the force between them - will be equal to your formula there.

 

[LuigiHomer]

Okay.The two point masses are in KG.The distance is in metres.G is in Newtons.

 

[DaveC426913]

So, what answer did you get?

The formula you have listed will calculate "the force of attraction between two bodies". One force, not two. Not sure where the F1=F2= came from.

 

[LuigiHomer]

I can't figure it out.Kind of new to the concept of using Newton's laws.Kind of new to physics.

 

[molinaro]

I would think F1 is force felt by object #1 and F2 is the force felt by object #2, and they are equal in magnitude, while opposite in direction.

Simply multiply and divide and you are done.

G x M1 X M2 / (R x R) = F1 = F2

From your post we have:

M1 = 400 KG
M2 = 300 KG
R = 2000 M

And we know G.

So, just do the math! There's no physics left to figure out.

 

[LuigiHomer]

I don't have a calculator that can even REGISTER Newtons,and our teacher took it away.:(What a meanie.

 

[LuigiHomer]

My sister THINKS it is 0.030.

 

[LuigiHomer]

Do you guys have a suggestion
for a good, reliable computer calculator for free that can do what Molinaro said to do?

 

[LuigiHomer]

@ DaveC,It is that they BOTH exert gravitational force.F1 is equal to F2,which is the other force.

 

[molinaro]

Do you guys have a suggestion
for a good, reliable computer calculator for free that can do what Molinaro said to do?

> START > PROGRAMS > ACCESSORIES > CALCULATOR

then menu > VIEW > SCIENTIFIC

 

[LuigiHomer]

My sister didn't incorporate G.My head hurts.I'm only in 5th grade,you know.

 

[LuigiHomer]

I think it's 0.6.Please help me.More.

 

[DaveC426913]

I don't have a calculator that can even REGISTER Newtons,and our teacher took it away.:(What a meanie.

You don't need a calculator that registers' Newtons...
You're just doing math.

 

[DaveC426913]

@ DaveC,It is that they BOTH exert gravitational force.F1 is equal to F2,which is the other force.

They do both exert a force. That formula will calculate the entire forfce between the two masses.

 

[LuigiHomer]

You don't need a calculator that registers' Newtons...
You're just doing math.

Once again,I AM A FIFTH GRADER!

 

[DaveC426913]

Once again,I AM A FIFTH GRADER!

I'm sorry, I missed that.

Have you learned exponents?
6.67x10^-11 is equal to .0000000000667

So:

F = (.0000000000667)*400*300 / (2000^2)

Masses of 300-400kg that a distance of 2km have an extremely small force of attraction.
Your answer should be a very, very small number - about 11 zeros.

 

[jtbell]

I'm only in 5th grade,you know.

No, we didn't know that, until you mentioned it in this post. :uhh: