# Forces between 2 protons

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Thread starter 3 years ago
#1
I know that the forces acting between 2 protons are:

Gravitational attractive force
Electrostatic repulsive force
Strong nuclear force

However, I am not sure what the relationship between these 3 forces is.

Is it Fs = Fg + Fe or Fs = Fe - Fg ?

Or are these the same, but the second one is considering the direction of the force whereas the first is only considering magnitude, since -(-) would give you an addition of the magnitudes of the two forces?
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3 years ago
#2
(Original post by voltz)
I know that the forces acting between 2 protons are:

Gravitational attractive force
Electrostatic repulsive force
Strong nuclear force

However, I am not sure what the relationship between these 3 forces is.

Is it Fs = Fg + Fe or Fs = Fe - Fg ?

Or are these the same, but the second one is considering the direction of the force whereas the first is only considering magnitude, since -(-) would give you an addition of the magnitudes of the two forces?
The strongest force is the strong, followed by the electrostatic, followed by gravity

In fact, Fs > Fe + Fg ( I am 99% sure of this)

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Thread starter 3 years ago
#3
(Original post by Kyx)
The strongest force is the strong, followed by the electrostatic, followed by gravity

In fact, Fs > Fe + Fg ( I am 99% sure of this)

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So the equation to use would be Fs = Fg + Fe? Its just that I came across a past paper question which uses Fe = Fg + Fs so I'm a but unsure.
0
3 years ago
#4
(Original post by voltz)
So the equation to use would be Fs = Fg + Fe? Its just that I came across a past paper question which uses Fe = Fg + Fs so I'm a but unsure.
I think I get it now.

The protons experience no net force, so Fe = Fs + Fg

Therefore Fs = Fe - Fg

Do you know the answer to the question?

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Thread starter 3 years ago
#5
(Original post by Kyx)
I think I get it now.

The protons experience no net force, so Fe = Fs + Fg

Therefore Fs = Fe - Fg

Do you know the answer to the question?

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Yes, the answer is Fs = Fe - Fg.

Would you not get the same answer if you used Fs = Fe + Fg but ignored the minus sign on the gravitational force? So adding the magnitudes?
0
3 years ago
#6
(i) Complete Fig for the time until the ball reaches B. Im new dont know where to get an answer hope someone helps.
0
3 years ago
#7
(Original post by voltz)
Yes, the answer is Fs = Fe - Fg.

Would you not get the same answer if you used Fs = Fe + Fg but ignored the minus sign on the gravitational force? So adding the magnitudes?
I do not know

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