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Hammer flipping experiment?

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Neil Wyatt06/07/2020 18:26:33
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This little piece was written as a space filler in MEW 294.

Anyone fancy giving it a go? No spoilers please, I want your own theories:

Here’s an interesting little experiment to try in your workshop (or outside in the garden) as an alternative to going stir crazy (come to think of it, if the neighbours spot you, they may think you have already gone stir crazy). Please be careful throwing heavy tools around…

Take a hefty claw hammer, the sort with a decent wooden shaft. Hold it in your good hand, the face pointing down and the claws upwards. Flip it gently upwards in a single end over end spin and catch the handle.

Which way is the head pointing now? Repeat it, which way is the head pointing. Repeat this a few times and see if you can spot a pattern.

Now hold it with the head horizontal and the face pointing to your left.

Again, flip it gently upwards and catch the handle. Which way is the head pointing now? Repeat the action a few times.

I’m particularly interested in your personal theories about what is happening rather than the results of any internet searches.

Neil

Ady106/07/2020 19:08:23
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spooky science

JasonB06/07/2020 19:11:27
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Don't try it in your flip-flops!

Pete Rimmer06/07/2020 19:22:52
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I flipped my claw hammer 10 times. Dropped it twice but each time I didn't drop it I caught it with the hammer face down.

Nick Clarke 306/07/2020 19:24:36
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bandage.jpeg

Actually my foot, but you get the idea!

Edited By Nick Clarke 3 on 06/07/2020 19:25:14

JasonB06/07/2020 19:54:59
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Always the same way up with minedevil

Buffer06/07/2020 20:00:25
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Freaky!

Buffer06/07/2020 20:00:27
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Edited By Buffer on 06/07/2020 20:02:40

Neil Wyatt06/07/2020 20:11:55
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Well so far I've learnt what a clumsy lot you are. Should never be allowed near rotating machinery, let alone 'ammers!

Neil

P.S. very good Jason

duncan webster06/07/2020 20:24:41
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I don't actually own a claw hammer, too much like woodwork for me. However I've tried it with my collection of ball pein and straight pein hammers and they stay the same way up, ie face down

David Noble06/07/2020 20:42:26
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Edited By David Noble on 06/07/2020 22:15:55

David Noble06/07/2020 21:00:39
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Very strange, I've just been reading about this

I'm having trouble copying and pasting though. Try Googling "Russian astronaut wing nut"

David

(edit) Sorry Neil, just spotted the no internet searching bit 

 

 

 

Edited By David Noble on 06/07/2020 21:02:25

Nick Clarke 307/07/2020 07:56:29
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Posted by duncan webster on 06/07/2020 20:24:41:

I don't actually own a claw hammer, too much like woodwork for me. However I've tried it with my collection of ball pein and straight pein hammers and they stay the same way up, ie face down

In my case it should be spelt pain!

DiogenesII07/07/2020 08:47:18
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..has this come about from your researches into the Grateful Dead, Neil? ..there's a certain relevance..

steamdave07/07/2020 10:16:22
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Or for some Real fun with a hammer, try this:

https://www.youtube.com/watch?v=tTqbdxL_gmU

Dave
The Emerald Isle

SillyOldDuffer07/07/2020 11:18:24
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Posted by Neil Wyatt on 06/07/2020 18:26:33:...

Take a hefty claw hammer, the sort with a decent wooden shaft. Hold it in your good hand, the face pointing down and the claws upwards. Flip it gently upwards in a single end over end spin and catch the handle.

Which way is the head pointing now? Repeat it, which way is the head pointing. Repeat this a few times and see if you can spot a pattern.

Now hold it with the head horizontal and the face pointing to your left.

Again, flip it gently upwards and catch the handle. Which way is the head pointing now? Repeat the action a few times.

I’m particularly interested in your personal theories about what is happening rather than the results of any internet searches.

Neil

Results

1. Flipping the hammer with the face down and the claw up (vertical) results in the hammer rotating 360° back to the same position, face down.

2. Flipping the hammer sideways (face and claw horizontal) results in the head and claw swapping sides, ie the head rotates horizontally by 180° during the 360° turn.

The horizontal turn is too fast to follow, but I think its only 180° not 540°.

Duffer's Hypothesis

Head down the hammer is balanced along the axis of the handle. All the forces acting on the hammer are in the same plane, so the hammer does a single turn at right angles to it. The axis is the hammer's centre of gravity,

Head horizontal, the hammer isn't balanced along the handle. The head is heavier than the claw. When the hammer is tossed, two forces are applied because the centre of gravity is off centre in one plane. As the hammer rotates backwards it also turns sideways.

Confirmation.

Of concern is the hammer appears to rotate more or less exactly 180°. If the centre of gravity hypothesis is correct, I would expect the hammer to turn at some angle proportional to the imbalance. Testing with other types of unbalanced hammer (ball pein and cross-pein types) shows they also apparently rotate by 180°. And testing with a balanced mallet (same head shape and weight both sides) shows it too spins by 180° Claw hammers are a red-herring.

Conclusion,

Duffer's First Hypothesis is either wrong or much too simple.

sad

Second Hypothesis. The unbalancing force is due to the earth's rotation.

This may have legs. Tossing the balanced mallet facing south, it appears to reliably turn anti-clockwise by 180° and facing north, it appears to reliably turn clockwise. Facing East and West, the mallet still turns, but it appears less reliable, maybe spinning only a bit over 90° Not confirmed - the turns are hard to follow by eye. Wish I had a high-speed camera.

Dave

Georgineer07/07/2020 12:29:51
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... - the turns are hard to follow by eye. Wish I had a high-speed camera.

Dave

When somebody tried to teach me juggling, I was given silk handkerchiefs to start with because they slow the gravity down. Would it help if you started with a rubber hammer, or one made of marshmallow?

George B.

Howard Lewis07/07/2020 12:37:44
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My brain can't handle this, it does my head in, causing too much pein. It has me clawing at the walls!

Howard

pgk pgk07/07/2020 13:52:21
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Posted by Georgineer on 07/07/2020 12:29:51:

When somebody tried to teach me juggling, I was given silk handkerchiefs to start with because they slow the gravity down. Would it help if you started with a rubber hammer, or one made of marshmallow?

George B.

You're going to upset Mr Newton by tryng to slow gravity. Anyhoo...David Noble's search link shows this happens in zero grav on the ISS. Parachute hammers are not the answer. Nor apparently that the ISS is going quite fast in a circle - as indeed are we...

pgk

Baz07/07/2020 14:19:10
409 forum posts

To me this just proves that we need to get out more😃

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