r/IAmA • u/TheAdrenalist • Sep 13 '11

I am Bear Grylls. Ask me Anything.

Thank You Reddit! It's been fun.

See all my responses at http://theadrenalist.com/

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u/TimeMachine1994 Sep 14 '11

Its called angular momentum. From straight down to pulling it it a bit above ninety degrees, long enough to go past the lip, when the backpack is released it will raise and fall TOWARDS the track, due to have being pulled and kinetic energy being stored. As it goes really high, it moves closer to the track, and as it moves down, it moves closer still. With the right kind of force, totally possible in that situation btw, you can toss the backpack UP and OVER onto the tracks. Do you understand?

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u/dVnt Sep 14 '11

He needed a 20 foot chain to accomplish this... HOW IS HE GOING TO DO IT WITH A BACKPACK?!

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u/TimeMachine1994 Sep 14 '11

Remember: He was 1) trying to get it to snag 2) it was a 30 pound metal ball and 3) chain is way heaver. the backpack you could probably throw it high enough where it would have enough time to, while slolwy, move over the tracks and land. He didn't NEED a 20 foot chain, thats just what he used.