Hi dshannon,

Here's a website about how to measure antioxidants in food:

http://en.wikipedia.org/wiki/Oxygen_Rad ... e_Capacity

Hi chickentown,

Yes, that was pretty much how I did wheels part of my car.

Hi chickentown,

Yes, I think your car didn't move because the axles were too low. So maybe there was too much friction? But I'm not entirely sure. Does anyone else know?

Hi chickentown,

Yes. You have to tie it or attach the string somehow to the axles in order for the car to move when you drop the weight.

Hi chickentown,

The height of the stick of wood should be .100 meters - the height that you are going to drop the weight.

Hi chickentown, Yes, the car would go faster if it is less heavy. So basically, try to make your car as light as possible, but heavy enough so that it's steady; it won't topple when you put the 1 kg weight on it. I think your dimensions are ok. For the axles, I'm not sure what I used because my dad ...

Hi chickentown,

I'm sorry. I don't know the exact dimensions of mine, but I'm going to say the dimensions were like a regular hardcover book.

Hi chickentown,

For the string, I just used regular string that my teacher gave me. And I attached the stick of wood in the middle by drilling a nail from the bottom of the car and up into the wood. You could also use superglue. =)

Hi chickentown, Your project is very similar to mine. Well for mine, I used CDs for the wheels and wood for the body. For the pulley part, I used had a piece of wood sticking out from the middle and then I attached an object (i'm not sure what it's called) on top. The object is sort of like a reel. ...

Hi cLoUd9_mylo,

Here a website I found that seems to answer your question. There seems to be a lot of different uses for sunflower seeds.

http://ksks.essortment.com/sunflowershisto_rnis.htm

Hope this helps. =)

Hi cLoUd9_mylo,

I found some websites that can answer your questions:

http://www.findarticles.com/p/articles/ ... 2603000387
http://www.mothernature.com/Library/Boo ... /15/92.cfm

Hope this helps. =)

Hi Haku,

Your project seems similar to something I did. I had also asked for help so here is the topic thread:

https://www.sciencebuddies.org/mentorin ... php?t=1573

Check it out and see if my project is like yours. Hope it helps! =)

Hi johnsondek,

Here's a website I found that tells you what the ph level of vinegar is:
http://www.jackeden.com/tips/phmat.html

Hope this helps. =)

Hi, Some ways you could measure the dehydration of apples is to weigh them before and after you dehydrated them. Also you could time how long it takes each apple to dehydrate. Here's the website where I found the information: http://www.selah.k12.wa.us/SOAR/SciProj2003/RochelB.html Hope this helps. ...

Hi, I couldn't find anything on using a "coloriemeter." Did you mean "calorimeter?" If you did, then I think you can, but I'm not sure how. The websites I visited mentioned measuring it by "indirect calorimetry." So I'm not sure. I'll have to do more research and then g...

Hi,

Here's a website that tells you what you should put on your display board:
https://www.sciencebuddies.org/mentorin ... oard.shtml

Hope this helps. Good luck. =)

Hi Marisa,

Could you also post your results?

So far, from the information you've given me, I think you're supposed to be looking for how the chlorophyll in the leaves have changed.

I hope this helps. =)

Hi Marisa,

Could you give me the url for your experiment so that I can check it out and get back to you? Thanks. =)

Hi KnightSaber, Go look at the 3rd website that jessicahua gave you in the other forum which is: http://www.virtualsciencefair.org/2004/fink4k0/public_html/pages/exp1.html Then scroll down and look at #8 in the Method section: 8. Line up the tubes from lightest to darkest purple. The lighter the sol...

Hi OneBriiguy!

Thanks for all your help!! I tested mine a few days ago and it went 8.4 meters. =D And I got enough points to get an A in AP Physics. =) Once again, thanks!! =)

Hi OneBriiguy!

Thank you very much for the information.

Now, I have another question. For the wheels, I've been thinking of using CDs or wheels from a toy car. Are there other kinds of wheels that I can use? Or are there materials I can use to make the wheels?

Hi OneBriiguy!

Is it possible to minimize the friction around the pulley and the axle of the wheel?

Hi OneBriiguy!

Thanks for the information and suggestion! =)

Do you, or anyone else, have any ideas on how to minimize friction?

Thanks!

hi everyone, For my physics class, I have to build a device that would be able to transport a 1 kilogram mass for a particular distance using the energy that is released from the 1 kilogram mass when it falls a distance of 10 centimeters. Here's the instructions: http://xf5.xanga.com/78bb81227913054...

Hi,

You can try going to google.com and typing in keywords like "oxygen experiments." Here's one that I found: http://www.light-science.com/oxygenexper.html
Hope this helps. Good luck. =)

Hi, Does he just want to find differences? If he doesn't, then another thing you can do with spiders and insects could be to observe what they do everyday or put them together and see how they interact with each other. Another suggestion would be to make spiders interact with something and then do t...

Hi,

If you need more information about the question, hypothesis and conclusion parts, you can look here:

https://www.sciencebuddies.org/mentorin ... thod.shtml

And he doesn't need to include why he wants to know this unless he is required to.

Good luck with your project. =)

Hi, Thanks for all the advice but I didn't have time to change/add things to my catapult because I had to turn it in today. I really appreciate your help though. I learned a lot more new things from this. I'll keep all of the advice in mind...in case I have to build another one sometime in the futur...

Hi everyone, I'm building a catapult for my physics project where my throwing arm can be only 50cm (which is pretty short) long from the pivot point and it should weigh relatively light. I have to throw a hackysack 25 meters or more to get a good grade, but so far I can only manage to throw it aroun...

Hi everyone, My project for my physics class is to build a catapult. My teacher has not given out the requirements for it, so I'm just researching some ways to build a catapult out of accessible materials. Anyone have any ideas? Also what part of a catapult affects how far a catapult launches someth...