XKCD What If is a brilliant website by a NASA physicist turned cartoonist where he investigates questions sent in by various readers.
There are quite a few about falling objects and various changes in momentum, so they link well to P4 - Explaining Motion. Here are a few examples:
http://what-if.xkcd.com/51/ - What place on Earth would allow you to freefall the longest by jumping off it?
http://what-if.xkcd.com/44/ - How high can a human throw something?
http://what-if.xkcd.com/39/ - How hard would a puck have to be shot to be able to knock the goalie himself backwards into the net?
http://what-if.xkcd.com/28/ - From what height would you need to drop a steak for it to be cooked when it hit the ground?
http://what-if.xkcd.com/18/ - What would it take to stop an out-of-control freight train using only b.b. guns?
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