00:01
Okay, so we've got a multiple choice question here about impulse and momentum.
00:05
If you look at this equation here, you've got j, which is your impulse, force times time, that's equal to impulse.
00:12
Mass times change in velocity, that's equal to impulse, but it's also your change in momentum.
00:17
And then this is your change momentum here.
00:18
So these are the variables that they ask about.
00:20
So for example, with the padded dashboard, okay, so with the padded dashboards here, what are we doing here? are we reducing the change momentum? no, because if you look at this equation here, your mass is staying the same, right? your change in velocity is staying the same.
00:37
If you're going from 30 miles per hour to zero during a crash, it doesn't really matter.
00:41
The padded dashboards don't change that fact.
00:44
You still started at 30 miles per hour.
00:46
You're still ending at zero.
00:47
So these two variables are not being affected here.
00:50
Is it increasing in change in momentum? no, those are saying the same...