Re: Experimental Design B/C
Posted: October 20th, 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!
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Re: Experimental Design B/C
Posted: October 20th, 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.
Re: Experimental Design B/C
Posted: October 20th, 2009, 5:59 pm
Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.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.
We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.
Re: Experimental Design B/C
Posted: October 20th, 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.
Re: Experimental Design B/C
Posted: October 21st, 2009, 6:26 am
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 wrote:Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.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.
We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.
Re: Experimental Design B/C
Posted: October 21st, 2009, 7:43 am
Argh, should have thought of that.Flavorflav wrote: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 wrote:Trouble with that is, it'd be hard to apply the same amount of force for each adhesive.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.
We tried using gravity as our force, but it took way too long. which is why I started yelling at the tape.
Re: Experimental Design B/C
Posted: October 22nd, 2009, 7:24 am
That's a good idea! I can't believe We didn't think of that!
Re: Experimental Design B/C
Posted: October 23rd, 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.
Re: Experimental Design B/C
Posted: November 1st, 2009, 6:36 am
Just curious, what do your teams do for the line of best fit?
Re: Experimental Design B/C
Posted: November 1st, 2009, 8:00 am
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.eyeball138 wrote:Just curious, what do your teams do for the line of best fit?