In this experiment a trigger (of any kind) is set. After 30 seconds the trigger must fire and sending a cue ball down a ramp. We have been experimenting with different triggers and are having difficulting finding something that works. Any suggestions would be greatly appreciated.
We've been experimenting with firing a cork out of a tube filled with baking soda and vinegar and using a counter balance filled with sand that empties over time.
2006-11-19 03:26:20 · 5 answers · asked by JValdez 1 in Science & Mathematics ➔ Other - Science
Detailed suggestions on how to get the trigger firing 30 seconds after being set would be helpful.
2006-11-19 04:04:42 · update #1
My daughter is also in 8th grade and you can appreciate the number of hours we dads struggle with these projects.....I am currently building (helping to build) a miniature, erupting volcano.....You know kids like flash....they love the show. I sat here for a while and thought how about a real timer, like an old style egg timer. you know, the ones with the big knob that you wind up? A 6 volt battery and a filament or model rocket igniter.(you can get these at the hobby store or make your own out of wire.....My daughter and I built a series of light bulbs for a 7th grade science project ) If you run a wire from the battery and glue it on the timer at an appropriate location...then glue(attach) the other wire to the knowb so that when the timer is wound up the wire moves toward the other and completes the circuit in the appropriate amount of time. Connect a piece if thin wire as a "gate" to hold the ball and when the timer runs out the battery energizes the wire causing it to melt...the ball rolls down the ramp. Have fun.....
2006-11-19 06:29:07 · answer #1 · answered by jackwp2000 2 · 0⤊ 0⤋
How about a balance arm with a funnel filled with sand on one side, and a lighter weight on the other (like a miniature teeter-totter from the playground). Pull the plug on the funnel, and the sand will drain out the heavier arm, and at some point will become lighter than the other arm, and the arm with the sand filled funnel will rotate up. If the arm with the funnel is blocking the track on which the cue ball rests, then when it moves up, the ball will then be free to roll down the ramp.
You would have to fiddle with the proper amount of sand and the hole size in the funnel to hit the 30 sec mark. Or you might also fill the funnel with water rather than sand if the hole is really small. Good luck- sounds like a fun father-daughter project!
2006-11-19 04:22:34 · answer #2 · answered by WildOtter 5 · 0⤊ 0⤋
physical science projects 8th grade pleasee
2016-05-22 03:30:19 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Use a spring like in a pinball machine
2006-11-19 03:38:31 · answer #4 · answered by cassie8415 1 · 0⤊ 0⤋
Have you tried an elastic, wound up?
Or, ballooon with a slow leak?
or maybe a candle wick, and lite it?
2006-11-19 03:30:51 · answer #5 · answered by Barbados Chick 4 · 0⤊ 0⤋