Exam-style question
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What is the effect of doubling both masses on the gravitational force between them?.
- A.The force remains the same.
- B.The force doubles.
- C.The force quadruples.
- D.The force halves.
Model answer
What a good answer should say
- The force quadruples.
Explanation
Why this works
According to Newton's law of gravitation, if both masses are doubled, the gravitational force increases by a factor of four (quadruples) because the force is directly proportional to the product of the masses.
Common mistake
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