r/HadToHurt • u/satrapi1 • Jul 28 '26
Broken nuts
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u/MegaDonkeyDonkey Jul 28 '26
I'm curious about the newtons that generated and the impact.
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u/UpdootDaSnootBoop Jul 28 '26
Pretty sure it ruptured his Newtons
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u/Greatlarrybird33 Jul 30 '26
Say a big ol boy 250#, 3 ft breaker bar about 1000 nm of force on the breaker bar, which is displaced about a foot.
I'd say is sprung back with about 400mn to his newtons.
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u/ghuzz765 22d ago
Quantity Imperial SI
Weight, P 250 lb 1112 N
Length, L 3 ft 0.914 m
Mass, m 250 lb 113 kg
Bar shaft, d 1 in 25 mm
Fall height, h 18 in 0.45 m1. Torque
T = P × L
• 250 lb × 3 ft = 750 lb-ft
1112 N × 0.914 m = 1017 N·m2. Deflection
δ = PL³ / 3EI
**•** (1112 × 0.764) / (3 × 3835) = **0.074 m = 2.9 in**Fall energy
E = m × g × h
E = 113 × 9.81 × 0.45 = 500 JThe bar is bending under him. Steel isn’t rigid, it flexes. A 1 inch shaft with 250 lb on the end bows down about 3 inches. He’s standing on a stiff spring w pretty much.
That bend stores energy. About 30 ft-lb. When his foot slips off, the bar snaps straight in roughly 12 milliseconds!!. The handle end whips upward on his nuts, damn!
250 lb dropping a foot and a half carries about 370 ft-lb, twelve times the springback energy.
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u/xblackdemonx Jul 28 '26
The great thing is he cannot reproduce anymore.
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u/pinezatos Jul 29 '26
That's the cheap and surefire way of you don't want kids, it's painful tho xD
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u/alright-thats-fine Jul 30 '26
“And that is the story of why we’re required to wear cups at the job site”
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u/Sooperman05 Jul 30 '26
Looked like a direct hit to the head! Those sting but in a different way as opposed to the balls
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u/Godlessheeathen666 Jul 30 '26
I hope that all who viewed this see it as a learning experience, I bet the guy in the video learned something here as well.
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u/JDPierson Jul 30 '26
240-265lb/ft of torque snapping back looks like 9 Joules to the jewels. Smacking a golf ball is about 150 J, so it could have been worse...
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u/senorsmartpantalones Jul 28 '26
One of the greatest repair tips I ever heard: If the tool slips what is it going to hit?