Multiple Choice
In Newton's law of universal gravitation, , what two factors determine the magnitude of the gravitational force between two objects?
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8. Centripetal Forces & Gravitation
Newton's Law of Gravity
Multiple Choice
Which of the following processes relies most directly on Newton's law of universal gravitation as the dominant force governing the motion?
A
The orbital motion of planets around the Sun
B
The flow of electric current through a copper wire in a circuit
C
The attraction between two bar magnets
D
The buoyant rise of a hot-air balloon in Earth's atmosphere
Verified step by step guidance1
Identify the nature of Newton's law of universal gravitation, which states that every two masses attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them, expressed as \(F = G \frac{m_1 m_2}{r^2}\), where \(G\) is the gravitational constant.
Analyze each given process to determine which force is dominant: gravitational force, electromagnetic force, or buoyant force.
Recognize that the orbital motion of planets around the Sun is governed primarily by the gravitational attraction between the Sun and the planets, making Newton's law of universal gravitation the dominant force in this scenario.
Understand that the flow of electric current involves electromagnetic forces acting on charges, the attraction between bar magnets is due to magnetic forces (a form of electromagnetic force), and the buoyant rise of a hot-air balloon is governed by fluid mechanics and buoyant forces, not gravity as the dominant force.
Conclude that among the options, the orbital motion of planets around the Sun relies most directly on Newton's law of universal gravitation as the dominant force governing the motion.
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