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Punching Rollerblader

+3
Mike MacLellan
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Post  Dave-O Thu Sep 20, 2012 4:28 pm

Question: If a 168 pound runner moving at 5:30/pace throws a haymaker at a rollerbladder coming towards him at the same speed, what will the force exerted on this guy's face be?

http://www.myfoxchicago.com/story/19593539/lakefront-runners-on-alert-for-attacks

I want to cross paths with him so badly tonight.
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Post  Alex Kubacki Thu Sep 20, 2012 5:01 pm

Ah physics. If I remember correctly ( and I probably don't) Force or Kinetic Energy is Half Mass times Velocity Squared. I think.
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Post  Mike MacLellan Thu Sep 20, 2012 5:55 pm

F=ma.

KE=.5mv^2.

This guy sounds hilarious, btw. Probably whacked out of his mind. I want to meet him.
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Post  Nick Morris Thu Sep 20, 2012 7:59 pm

92 lbs/square inch??
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Post  Schuey Thu Sep 20, 2012 10:37 pm

Sweet this dude is doing this right were I do lot of my runs! I hope this SOB tries to hit me, I can promise 100% I will knock him on his ass.
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Post  Admin Thu Sep 20, 2012 11:52 pm

5,000 Newtons... more or less.

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Post  Dave-O Fri Sep 21, 2012 9:23 am

Schuey wrote:Sweet this dude is doing this right were I do lot of my runs! I hope this SOB tries to hit me, I can promise 100% I will knock him on his ass.

I was out there for 12 yesterday. No luck finding the SOB.
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Post  John Kilpatrick Thu Sep 27, 2012 1:13 pm

I'm guessing this guys days are numbered... No shortage of nutjobs in this world.

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Post  Mike MacLellan Thu Sep 27, 2012 1:20 pm

Mr MattM wrote:5,000 Newtons... more or less.

That's the equivalent of 500kg sitting on his face. In ~6-7sq inches. So 155-180psi. It takes 160 to break bone.

You can do it, Dave!
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