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How does the source state Newton's second law of motion in terms of momentum?
AThe net force equals the change in momentum divided by time
BThe net external force equals momentum multiplied by time
CThe net external force equals the square of the change in momentum
DThe net external force equals momentum divided by mass
Answer & Solution
Correct answer: A. The net force equals the change in momentum divided by time
1. The source restates Newton's second law using momentum rather than acceleration.
2. It defines the net external force as the change in momentum of a system divided by the time over which it changes.
3. This form reduces to the familiar F equals ma only when the mass of the system stays constant.
4. Multiplying momentum by time, squaring the change in momentum, or dividing momentum by mass are not how this law is written.
_Source: OpenStax College Physics (CC BY 4.0), Ch 8 "Linear Momentum and Collisions", section 8.1 Linear Momentum and Force_
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