If a car is gradually pushed to a speed of 1 m/s, what determines the change in its momentum according to the second law of motion?
Both the magnitude of the force and the time during which the force is applied determine the change in momentum.
By the second law, the change in momentum equals the force multiplied by the time for which it acts (impulse): Δp = F × t.
So a small force acting for a long time can give the same change in momentum as a large force acting briefly.
Both the size of the force and its duration therefore decide the change.
Hence, the answer is that both the magnitude of the force and the time during which the force is applied determine the change in momentum.
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