Biology And Earth Science – Forces, Magnetism, Moon Phases, Microbiomes, And Ecosystems Practice Test

An object experiences a net force of 3 N for 4 seconds. What is the impulse delivered?

8 N s 10 N s 9 N s 12 N s

Correct Answer:

12 N s

Explanation:

Impulse is the change in momentum, and when a net force is constant, it equals the force multiplied by the time it acts. With a 3 N force acting for 4 seconds, the impulse is 3 N × 4 s = 12 N·s. That impulse is the amount by which the object's momentum changes in the force’s direction. If the force weren’t constant, you’d add up F dt over the interval, but here multiplication suffices.

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