3 ms·
Sounds like junk science to me. Just cribbing from Wolfram here: http://www.wolframalpha.com/input/?i=gravitational+potential+energy+of+75kg+at+1.5m http://www
by Cushman 13y ago
Sounds like junk science to me. Just cribbing from Wolfram here:
http://www.wolframalpha.com/input/?i=gravitational+potential+energy+of+75kg+at+1.5m http://www.wolframalpha.com/input/?i=gravitational+potential... ...energy of 75kg at 1.5m = 1.10 kJ
http://www.wolframalpha.com/input/?i=kinetic+energy+of+75kg+at+20kmph http://www.wolframalpha.com/input/?i=kinetic+energy+of+75kg+... ...at 20kmph = 1.15 kJ
That is to say, your head is likely to experience roughly the same force when riding head-first into a brick wall at 20kmph as falling head-first onto pavement from a high seated position, but one of these can happen at any speed.
- bryanlarsen 13y agoI think the point is that below 20km/h is a speed that evolution has experience with. At those sorts of speeds your instincts are going to do a lot to protect your head: throwing your arms up, for example. The arms might break, but your head will be somewhat shielded.