Question

Could someone please help me ASAP?

If you wear kneepads when skating, after a fall to your knees, it will take 3 times as long for them to come to a rest. How does this affect the change in momentum of your knees during the fall?

Answer 1

The change in momentum is the same with or without the kneepads.

Step-by-step explanation:

Momentum is defined by the equation:

`p=mv`

with ΔM will be the same as there are equal initial and ending velocities.

When you fall, you have some momentum when you hit the ground. What stops your fall and how long it takes to stop your fall are irrelevant.

It must still find a way to absorb the same amount of momentum. You're still falling as long as your body has any remaining downward momentum.

The overall change in momentum may alternatively be thought of as a certain amount of "impulse," which is the result of force and the duration of the force.

As a result of the slower rate of momentum absorption compared to bare flooring, the force exerted on your knees by the knee pads is less than it would be without them.

Hence, The long period of time will cause the velocity to decline, which will also cause the impulse applied to your knee to decline.

What is impulse?

The change in momentum of an object is the impulse it experiences.

It is defined by the equation:

`J= \(\delta \)P{=m(v-u)`

Where:

• J - impulse.
• ΔP - Change in momentum
• M - mass of body
• V - final velocity
• U - initial velocity

`V=\frac{\text{distance}}{\text{time}}`

When the time of fall increases threefold, the final velocity decreases threefold. Your knee will get less of an impulse since the velocity will be lowered.

Thanks,

Eddie