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Doubling the net external force on a fixed mass changes the acceleration to:
AOne quarter of it
BExactly the same
CTwice its value
DHalf its value
Answer & Solution
Correct answer: C. Twice its value
1. The second law makes the dependence exact.
2. Acceleration is exactly linearly proportional to the net external force.
3. Linear proportionality means the two scale by the same factor.
4. Here the force is doubled while the mass is held fixed.
5. So the acceleration doubles.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_
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