calculus problem: motion

This is a discussion on calculus problem: motion within the A Brief History of Cprogramming.com forums, part of the Community Boards category; I've got another problem in my calculus class. This particular project doesn't include *any* calculus whatsoever. In this case I'm ...

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    calculus problem: motion

    I've got another problem in my calculus class. This particular project doesn't include *any* calculus whatsoever. In this case I'm trying to design a contraption that raises the american flag so it doesn't get in the way of my math teacher's head when he walks near it. I've already come up with a goofy contraption that you can strap to his body so that when he gets closer to it the flag gradually raises...it works with ropes and pulleys but i was wondering if there was any method to detect when he is closer, such as something he can step on, that will activate an electric motor to raise the flag.

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    carry on JaWiB's Avatar
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    Did he offer you extra credit to do this? Or are you just bored?
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    we had to choose a problem that deals with math/science, and I chose to come up with a creative way to move the flag out of the way as he walks past it.

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    Toaster Zach L.'s Avatar
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    Piezzoelectrics could be useful. They convert pressure to electricity and vice-versa.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

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    Registered User major_small's Avatar
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    look for infared sensors for something like a desk/wall area were he walks by

    or a pressure sensor you could put in a mat

    look around for this: http://www.robotstore.com/search.asp...d=muscle+wires

    they use a small amount of electricity for alot of linear motion... and they can be used for millions of cycles each... they were used in the mars pathfinder project (http://www.robotstore.com/download/MW_on_Mars.pdf)
    Last edited by major_small; 10-09-2003 at 06:28 AM.
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    those are cool links. the problem is i have to actually make this.

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    Registered User major_small's Avatar
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    just put a little electricity through them and you have linear motion... it's not too hard to make, unless by make you mean from complete scratch, which would mean making the muscle wires, but then you couldn't use a pulley system either...
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    You need an electronic eye near the flag. When he steps in the way of the beam - similar to the beam at the bottom of automatic garage doors - the circuit is broken which fires off a motor that raises the flag.

    Current must pass through both the sender and the receiver of the beam. If the receiver does not see the beam - the current is directed back to the motor. Attach a pulley to the motor and attach a rope to the flag which goes around the pulley. When the pulley turns - the flag raises and lowers. When he steps out of the beam - the flag will also lower.

  9. #9
    & the hat of GPL slaying Thantos's Avatar
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    Step 1) Get some claymors
    Step 2) Set them up in front of flag
    Step 3) Make sure to inform the teacher so he doesn't walk in the mined area.

    Ok that was a joke

    You can get components that can tell you how far away something is for a few bucks.

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