What happened and who was involved — A child jumped on a trampoline but instead of falling directly to the ground, the child hit the safety net that surrounds the trampoline. The people involved are the child who was playing and the people who set up the trampoline with a safety net. Safety device used — The safety net around the trampoline. Physics concept explanation — The safety net works by increasing the time of impact when the child hits it. By stretching and catching the child slowly, the net spreads out the force over a longer time, reducing the force felt by the child. This relates to impulse and momentum: when the time of impact increases, the force decreases, which keeps the child safer.