- #1

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F = Gmm'/r^2

Does this explain the sum or total gravitational force between two bodies?

Does this explain the sum or total gravitational force between two bodies?

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- Thread starter Miike012
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- #1

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F = Gmm'/r^2

Does this explain the sum or total gravitational force between two bodies?

Does this explain the sum or total gravitational force between two bodies?

- #2

rock.freak667

Homework Helper

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F = Gmm'/r^2

Does this explain the sum or total gravitational force between two bodies?

It's just the gravitational force between two point masses. The gravitational force is equal and opposite on each mass.

If you have three masses, you'd need to apply more rules with the formula to get the resultant force.

- #3

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Maybe you can help with this question as well...

During a jump off a diving board, is your apparent

weight (a) equal to your true weight, (b) slightly less

than your true weight, (c) slightly more than your true

weight, or (d) zero?

The answer is zero? I thought it would have been (b)

- #4

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Last question... what is the equation...

F is proportional to m/r^2

F is proportional to m/r^2

- #5

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Is this only relevant to earth? therefore if I wanted to calculate the gravitational force of an object to mercury I would have to use another value that is not G?

- #6

DaveC426913

Gold Member

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Maybe you can help with this question as well...

During a jump off a diving board, is your apparent

weight (a) equal to your true weight, (b) slightly less

than your true weight, (c) slightly more than your true

weight, or (d) zero?

The answer is zero? I thought it would have been (b)

Why do you think it would have been b?

If you held a bathroom scale against your feet during your jump, what do you think the scale would show as your weight?

- #7

rock.freak667

Homework Helper

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Is this only relevant to earth? therefore if I wanted to calculate the gravitational force of an object to mercury I would have to use another value that is not G?

G is a universal constant, so in any calculation with that formula you'd use one value of G.

- #8

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Why do you think it would have been b?

If you held a bathroom scale against your feet during your jump, what do you think the scale would show as your weight?

Zero... but that's because you don't have the natural force of the ground to push up on the scale, which in return determines the weight....

But I also know w = mg.... and you have to have some initial acceleration greater than g and NOT zero to move upward... there for weight would exist..... would it not?

- #9

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So if I was listening to my self I should have actually said the weight would stay the same.

- #10

DaveC426913

Gold Member

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Weight is what a scale measures. It measures the force placed upon it. On the moon you would weigh less.So if I was listening to my self I should have actually said the weight would stay the same.

How much would you weigh in space, if you pressed the scale against your feet? (What would keep the scale pressed against your feet if you let go of it?)

How much would you weigh if you pressed it against your feet while suspended in midair (

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