# Thread: Egg cycling

1. ## Egg cycling

Jezza Bear was trying to keep fit the other day and decided to clean off his old tricyle and have a ride around the forest. As he merrily triked around Wise Old Olly Owl flew down and sat on his handlebars and they got discussing this and that.

Olly Owl posed this question.

If we constructed a rig on your trike such that we were able to suspend a golf ball 1 metre directly above your head whilst you were peddling and had a release mechanism to allow it to drop when I pulled a lever. Then I sat on the handlebars and I got Mrs Owl to sit on the back axle and we cycled off at a constant 3 m/s and I pulled the release mechanism who would more likely get the golf ball on their head?

2. ## Re: Egg cycling

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold"> If Jezza bear were pedaling forward then Mrs Owl would most like get hit. If Jezza Bear is pedaling backwards then Olly Owl (unless he did not pull the lever and get hit himself). Jezza Bear is not likely to get hit. </span hide>

Steve

3. ## Re: Egg cycling

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Olly Owl is more likely to get hit for posing the question when you're trying to exercise? <img src=/S/evilgrin.gif border=0 alt=evilgrin width=15 height=15></span hide>

4. ## Re: Egg cycling

<img src=/S/nope.gif border=0 alt=nope width=15 height=15> , I do not agree <img src=/S/flee.gif border=0 alt=flee width=25 height=25>

5. ## Re: Egg cycling

Sounds like a momentum issue. In this case the golf ball should hit Jezza on the head. Since all three objects (Jezza, trike, and ball) are moving at the same speed (velocity), inertia should carry the path of the ball slightly forward when released and at the same speed as Jezza on the trike, thus striking him on the head. Yes? No?

6. ## Re: Egg cycling

This is indeed my first awarded [choccy bar]. I think I'll frame it and hang it next to my first dollar earned. <img src=/S/bananas.gif border=0 alt=bananas width=33 height=35>

7. ## Re: Egg cycling

Did you take into account "air resistance"?

The air can be very "thick" and turbulent in forests. Dimples tend to give Golf balls "lift" so they do not fall as fast as other objects. The bike will also keep going at 3 m/s. The ball will slow down in the x-direction as it falls...

Steve

8. ## Re: Egg cycling

<img src=/S/hmmn.gif border=0 alt=hmmn width=15 height=15> Yes, I see what you mean. I would still suggest that it is more likely to be nearer Jezza Bear (as it was a very looooong bike <img src=/S/evilgrin.gif border=0 alt=evilgrin width=15 height=15>)

Seriously though, apparently there was a TV program on this last week and they tried the very same scenario, without a bear and owl, and did it with an egg. The poor rider got the egg on his head every time. Maybe it should be a KTS project and I could get the Jezzarettes to be my cycle riders[evulgrin]

9. ## Re: Egg cycling

Well of course an egg would be different than a golf ball. An egg is not round and does not have dimples. The air resistance is entirely different in the 2 cases.

Now if you would have asked about an egg falling rather than a golf ball I might have given you an entirely different answer....

Steve

10. ## Re: Egg cycling

Yes, I know you would have.......have a [choccy bar] anyway as I know you would have been right in that case <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

11. ## Re: Egg cycling

I can not (in good conscience) accept the choccy bar, as I was not correct. The air resistance is most likely too small to make a difference, even with a golf ball. You should not blindly accept "bluffing" from anyone in your puzzle answers <img src=/S/smile.gif border=0 alt=smile width=15 height=15>

<img src=/S/whisper.gif border=0 alt=whisper width=29 height=17> I said: "I might have given you an entirely different answer", but the truth is I would not have.

Steve

12. ## Re: Egg cycling

That is correct Richard.

I think this is the first time I have given you a [choccy bar] and a <!t>[tricycle repair Kit]<!/t> for a puzzle solution, I hope there are many more chances <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

Here is a link Mathematics of falling Bombs ( I don't understand the mathematics but it has quite a good description and graph to show the effect) The Golf ball will follow the same rules.

<img src=/S/whisper.gif border=0 alt=whisper width=29 height=17>Jezza bear is not very happy with Wise Old Olly Owl at the moment

13. ## Re: Egg cycling

I'd think, more particularly, that the meagre drop of 1m and the low speeds involved generally, would make the air resistance contribution trivial for a reasonably dense and aerodynamic shape of any sort.

Alan

14. ## Re: Egg cycling

For the golf ball, i estimate the difference is about 0.7 cm behind from the "target". If directly over the Jezza Bears head, it will therefore still hit his head.

My original answer was incorrect and I was giving Jerry a "hard time" to justify my mistake after I saw the correct answer.[evilgrini]

Steve

15. ## Re: Egg cycling

>estimate the difference is about 0.7 cm

<img src=/S/hmmn.gif border=0 alt=hmmn width=15 height=15> A very poor estimation if you ask me. After conducting experiments with a dimpled ball I have calculated that the difference should infact be 0.653cm. The 1 metre drop and air conditions would certainly effect the 'loftiness' of the ball <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

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