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The source rearranges Newton's second law in terms of momentum to define impulse. How is impulse expressed?
AAs the object's velocity multiplied by time alone
BAs the average net external force divided by the time it acts
CAs the mass divided by the change in velocity
DAs the average net external force multiplied by the time it acts
Answer & Solution
Correct answer: D. As the average net external force multiplied by the time it acts
1. The source rearranges F_net equal to delta p over delta t into delta p equal to F_net times delta t.
2. It names this quantity, force multiplied by time, the impulse.
3. Impulse equals the change in momentum, not force divided by time, mass divided by velocity change, or velocity times time alone.
4. This is why a small force acting for a long time can produce the same impulse as a large force acting briefly.
_Source: OpenStax College Physics (CC BY 4.0), Ch 8 "Linear Momentum and Collisions", section 8.2 Impulse_
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