WAEC Physics 2022 Paper

Concept:The area under a force-time graph represents impulse, which causes a change in momentum.Explanation:In a force-time graph, force $F$ is plotted on the y-axis and time $t$ on the x-axis.The area under the graph equals the product of average force and the time interval during which it acts.This product is called impulse, written as $J = F \Delta t$.From Newton's second law, impulse is exactly equal to the change in momentum: $F \Delta t = \Delta p$.Hence, the area under the force-time graph measures the change in momentum, not work done or energy change.Answer:B. change in momentum