gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. what effect…
gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. what effect does this have on collisions?\nthe change in momentum needed to stop the gymnast is increased.\nthe change in momentum needed to stop the gymnast is decreased.\nthe force exerted by the floor on the gymnast decreases.\nthe force exerted by the floor on the gymnast increases.
Answer
Brief Explanations:
According to the impulse - momentum theorem $J = \Delta p=F_{avg}\times\Delta t$. The change in momentum $\Delta p$ of the gymnast when stopping is determined by the initial and final velocities and is fixed. When the collision time $\Delta t$ increases (due to the foam floor), to keep the impulse $J=\Delta p$ constant, the average force $F_{avg}$ exerted by the floor on the gymnast decreases.
Answer:
The force exerted by the floor on the gymnast decreases.