The EPI. Help needed.

[pi]

Bump!

Anyone have a sample EPI? Just so I can get the format of it right next time.

[schnappy]

Depends on who marks it. I know most schools stick to doing it during restricted class time... at my school the 2 physics teachers do it different. One does it in school, after the mid year exam (Wierd but it makes sense I suppose) - the other gives you a huge amount of time to do but it needs to be good. Mine ended up being about 3000 words, as did most of the good ones. There was no word count noted, but it just turned out to go into depth that's what it ended out to be.

Edit: So I only read the last post and didn't realise this was bumped. I kept mine, but recently resorted and transfered all my files... not where I left, will get back to you. Edit: Can't find it. Fuck! There were a few things i was keeping in a certain folder... seams to be gone sorry

[FatnessFirst]

What's everyone doing for their EPI this year?

and what would be a decent EPI?
Who corrects it?

[pi]

What's everyone doing for their EPI this year?

and what would be a decent EPI?
Who corrects it?

We do it on the detailed study M&S and is corrected by our physics teacher.

[schnappy]

I measured the elasticity of different like materials in collisions.

Did not go so well, still got 39/40 though. Only lost a mark 'cos i didn't double my errors because of percentage division. I still don't understand how dividing percentages doubles error :/ I probably should have just done it anyway.

[Zien]

pi, has your EPI started this year?

Moderator action: removed real name, sorry for the inconvenience

[pi]

pi, has your EPI started this year?

Not yet, ours starts mid Term 2


Still looking for a sample one though...

Moderator action: removed real name, sorry for the inconvenience

[Zien]

Ours have started already.~ I'd give it a week before I crack. :p

I still have my write-up on Pendulums from my Year 11 EPI. That said, it wasn't really done that well at all in my opinion, but I could upload it for you to have a peek at if you want? (That is, if you can actually instruct me on how to upload stuff. :p)

[pi]

(That is, if you can actually instruct me on how to upload stuff. :p)

That would be awesome!

How to upload:
Reply to a post the normal way (ie not using 'quick-reply')
Click 'Additional Options'
Go to the 'choose file' button, and browse for file to attach
Write a message and then press 'post'

[Zien]

I uploaded the write-up; hope you find it useful! Btw, I had to hastily copy and paste my data/graphs from my Excel since VN wouldn't let me upload excel files. : / Well, there are many more omissions of fine detail I missed out when I actually wrote and handed this in that's more important. :p

[pi]

Thanks a lot!

I have attached my failed one... Any idea why I got a D?

My gut feeling was that it wasn't too bad...

[Bonifacio]

NO idea why the hell you got a D for that.

Energy goes where?
Due to ‘law of conservation of energy’, the mechanical energy must be transformed into another form of energy. This is most likely to be sound and heat. The transformation of energy into sound and heat is shown as the basketball loses height after each successive bounce (hence, the ball has a coefficient of restitution less than one).

I would say: A perfectly elastic collision occurs when the deformation of the ball and subsequent straing potential energy is transferred back into kinetic energy. As this is obviously an inelastic collision, some of the the strain potential energy is transformed to heat and sound energy. Thus the ball will have a smaller magnitude of kinetic energry immediately after hitting the groung and hence a smaller velocity, resulting in a lower height being reached. Therefore, the ball has a coefficient of restitution less than one.

[Zien]

Well I wouldn't know much about actually giving a grade to it (certainly doesn't look like a D to me) but I give some sort of a feedback on it:

- Try and make the aim stand out more. It's certainly not useless; in fact it is very important. Just sticking it down at the bottom doesn't give much emphasis to it, imo.

- For the materials section, try and involve a diagram to go along with that. Probably not on computer. Just a pencil and a ruler would be fine after you printed it out.

- Expand on your experimental method MUCH more. In my write-up, you can see that I placed a large emphasis on describing exactly what I did and why I did it (I got high marks in that regard, but failed at other things :p). You have to outline and give reasons as to why you did such and such.

- Table of values - These pages just hit me like a brick. I've never used this motion sensor equipment so I don't know how easy it is to organize the data you collected, but teachers hate nothing more than disorganized data. It's just a page filled with numbers (with you claiming an extraordinary number of significance as well) that mean very little by itself. It's literally a wall of text/numbers. Try and organize it better (can't give more advice since I haven't done the prac myself).

- As for the graphs you made, use a scatter plot and then trend-line it rather than using a graph that joins the dots and extrapolates for you. As for the meaning of the shape of the graph, I can't really expand since I haven't done the prac.

- Don't apologise for not knowing how to change something on excel. As long as you said which direction the displacement is (which you did), then you don't have to apologise for it. It's perfectly valid, as far as I know.

- Your calculations and interpreting the data seems fine (again, I can't comment on its validity since I haven't done the prac myself). But you haven't really expanded upon the errors associated with the experiment, apart from a line or two. That and the significance of your findings and how it relates to your aim. This is pretty much the bulk and purpose of a write-up and probably the area where you lost the most marks on.

[pi]

Thanks for those pointers guys!

[man0005]

Anyone have any sample centripetal motion EPIs? :/