Experimental Design B/C

Post by **nejanimb** » Tue Oct 20, 2009 3:27 pm

That sounds like a painful ED - I'm having a hard time thinking of anything even halfway decent to do with that. Urgh!

binary010101 · Post by **binary010101** » Tue Oct 20, 2009 4:32 pm

Tie washers to the string (for grip), tape on a vertical surface with the adhesives, pull, and time the length of time it takes for it to fall off.

Avis_de-Incendia · Post by **Avis_de-Incendia** » Tue Oct 20, 2009 5:59 pm

binary010101 wrote:Tie washers to the string (for grip), tape on a vertical surface with the adhesives, pull, and time the length of time it takes for it to fall off.

Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.

We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.

Post by **nejanimb** » Tue Oct 20, 2009 7:23 pm

Adhesion is just a difficult topic because it's so difficult to make that really quantitative. I could think of a zillion different experiments to do with those materials, just not within the topic of adhesion.

Flavorflav · Post by **Flavorflav** » Wed Oct 21, 2009 6:26 am

Avis_de-Incendia wrote:
binary010101 wrote:Tie washers to the string (for grip), tape on a vertical surface with the adhesives, pull, and time the length of time it takes for it to fall off.
Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.

We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.

Why not use a smaller piece of adhesive so that the gravitational force would be proportionately larger? Then you could use number of washers as your variable instead of time.

Avis_de-Incendia · Post by **Avis_de-Incendia** » Wed Oct 21, 2009 7:43 am

Flavorflav wrote:
Avis_de-Incendia wrote:
binary010101 wrote:Tie washers to the string (for grip), tape on a vertical surface with the adhesives, pull, and time the length of time it takes for it to fall off.
Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.

We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.
Why not use a smaller piece of adhesive so that the gravitational force would be proportionately larger? Then you could use number of washers as your variable instead of time.

Argh, should have thought of that.

duckiegirl2 · Post by **duckiegirl2** » Thu Oct 22, 2009 7:24 am

That's a good idea! I can't believe We didn't think of that!

2win · Post by **2win** » Fri Oct 23, 2009 8:39 pm

Yeah, it is. But I remember we tried an extremely small piece, and it didn't hold... I guess the time limit was making us not think right.

Post by **eyeball138** » Sun Nov 01, 2009 6:36 am

Just curious, what do your teams do for the line of best fit?

Post by **Paradox21** » Sun Nov 01, 2009 8:00 am

eyeball138 wrote:Just curious, what do your teams do for the line of best fit?

Even with a non-graphing calculator, you can enter data points into your calculator. I would suggest you consult a calculator manual to figure out if your calculator can do it or not. I use a TI-30X IIS and it gives me all the statistical analysis I need for Experimental Design. For the “line of best fit,” more accurately called the least-squares regression line, all you have to do is record the slope and y-intercept values your calculator spits out for regression line then plug in 3 or 4 points and draw them on your graph. Then you use a straight edge and connect the dots.

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