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Here's some stuff that I found printed on my McDonald's Happy Meal bag in February 2007. Is it me, or does everyone like their kids going around saying these things???

"Hi Ho Kracken!"
"cream-filled sock puppet?"
"my slimy little friend that I love to play with!"

What is McDonald's thinking?!?!? Is this how kids talk nowadays??? I wonder why?

So chemgeek thinks that a person accelerates up at about 1g while jumping. I think it's more like 3g.

If he's right and it's 1g, then the extra 5/6 g of being on the moon (and not having to fight earth's gravity while pushing off from the ground) would greatly increase your jumping speed. But if I'm right and it's 3 or 4g, then the extra 5/6 g from being on the moon probably won't add that much.

Now I want to try and think of a simple way to find out how fast we accelerate while we push off from the ground. It could be calculated from the ratios of how much we crouch to how high we go in the air, for example. But without Mythbusters-style high-speed footage of someone jumping in front of a wall painted in horizontal black-and-white bands, it's hard to come up with a number that's any better than one we just make up.

See how much good (ish) science this Happy Meal bag has stimulated? ;]

You people gave me a headache.

I gave the problem some thought while I couldn't sleep last night and came up with some model numbers: Bernardo is right that you're fighting both inertia and gravity when jumping and that inertia doesn't change. But if you look at a average poor jumper doing a jump from a standstill, he will probably crouch (moving his center of gravity -0.5m) and then jump so that his feet are 0.5m off the ground. So he will have to spend the same energy producing impulse for his jump that he has to use just to get up from the crouch (i.e. whatever it takes to move your center of gravity up half a meter).

On the moon, assuming everything else stays the same (no bulky spacesuits etc.) the work just to get up from the crouch decreases to 1/6, so he will have 1 5/6 times the work left for the actual jumping. So if the force that his muscles can generate is constant and the 0.5m that he crouched before the jump stay constant, he should end up with almost twice the lift-off velocity compared to earth. Of course that assumes that his muscels can contract fast enough to actually produce the speed.

Anyway, shouldn't the model jumper be able to jump almost 12x the heigth than on earth. Maybe my high school physics is so rusty that I messed up somewhere, but I don't think I did.

So, the better you are at jumping the less you benefit from the lower gravity, because the fraction of work you spend on just moving your ass, instead of accelerating, will be lower.

The airplane would never take off.. it's tires would fail first... Oh wait different problem.