Coulomb's law vs. Newton's law of gravitation?

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Homework Help Overview

The discussion revolves around comparing Coulomb's law and Newton's law of gravitation, focusing on their similarities and differences in terms of their formulas and underlying principles. Participants are exploring the conceptual framework of both laws in the context of physics.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the nature of the forces described by each law, particularly whether Newton's gravity can be repulsive compared to the electrostatic force. There is also a discussion about the significance of the constants involved and how they affect the comparison of forces.

Discussion Status

Some participants have offered hints and suggestions for further exploration, such as considering the physical significance of the signs of the quantities involved. There is an ongoing examination of the differences in units and the implications for comparing the forces described by the two laws.

Contextual Notes

Participants note that there may be confusion regarding the terminology, particularly distinguishing between Newton's third law and the law of gravitation. There is also mention of the challenge in finding clear comparisons due to the differences in the nature of the forces.

Brian S.
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What would be the easiest way to describe the similarities and differences between the two laws, other than the fact that their formulas are built similarly and they use different measurements. Any input would be great; I am currently having a brain block!

Coulombs Law:F=K (q1*q2)/r^2
Newtons 3rd Law: F=G(m1*m2)/r^2
 
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Hint: is Newton's Gravity ever repulsive? What about the electrostatic force?
You can also just google "comparison coulomb Newton"
 
Simon Bridge said:
Hint: is Newton's Gravity ever repulsive? What about the electrostatic force?
You can also just google "comparison coulomb Newton"
Thanks Simon, I have tried googling it and I didn't get quite the answer I was looking for.
 
Notice how enormous the value of Coulomb's constant is compared to the gravitational constant.
 
Oh? I found a whole lesson that lists similarities and differences and a raft of discussions on the same. More than enough to construct your own answer.
What sort of answer were you looking for?

Did you have a go following the hint given in the same post, the one in post #4?
 
MohammedRady97 said:
Notice how enormous the value of Coulomb's constant is compared to the gravitational constant.

The constants have different units and thus cannot be compared directly. I could easily define a set of units where the numerical value of the gravitational constant is orders of magnitude larger than Coulomb's constant. The relevant comparison would come from comparing, e.g., the gravitational force between two electrons to the electric force between the same electrons. This would be a comparison of forces, and thus be independent of the units chosen.
 
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Brian S. said:
What would be the easiest way to describe the similarities and differences between the two laws, other than the fact that their formulas are built similarly and they use different measurements. Any input would be great; I am currently having a brain block!

Coulombs Law:F=K (q1*q2)/r^2
Newtons 3rd Law: F=G(m1*m2)/r^2
Newton's 3rd Law of motion is not the law of gravitation. The third law is the law of action and reaction. The law of gravitation is a different beast altogether.

Can you list the points of similarity and dissimilarity that you have uncovered?
 
You can also think about the inputs (q1 q2 vs m1 m2), discussing how the signs of the quantities have physical significance
 

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