Question

how does the force of impact during a collision change when the time of contact is reduced? (1 point)
it increases.
it decreases.
it remains the same.
it instantaneously becomes zero.

Explanation:

According to the impulse - momentum theorem \(J = F\Delta t=\Delta p\). When the time of contact \(\Delta t\) is reduced, for a given change in momentum \(\Delta p\) (assuming the collision situation leads to the same \(\Delta p\)), since \(F=\frac{\Delta p}{\Delta t}\), a smaller \(\Delta t\) will result in a larger \(F\).

Answer:

It increases.