Exam-style question
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What type of forces do Coulomb's law and Newton's law of gravitation describe?.
- A.Coulomb's law describes attractive forces only, while Newton's law describes both attractive and repulsive forces.
- B.Both laws describe only attractive forces.
- C.Coulomb's law describes repulsive forces only, while Newton's law describes attractive forces.
- D.Both laws describe repulsive forces only.
Model answer
What a good answer should say
- Coulomb's law describes attractive forces only, while Newton's law describes both attractive and repulsive forces.
Explanation
Why this works
Coulomb's law specifically describes the forces between charged particles, which can be either attractive or repulsive depending on the nature of the charges (like charges repel, unlike charges attract). In contrast, Newton's law of gravitation describes the attractive force between masses, which always attract each other.
This distinction is important in understanding the different types of interactions in physics.
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