Physics Project...?
Well I have to make a car that is powered by a bag of 5lbs of weight. And has an adjustable braking system. What I have so far is a block of wood with aluminum axels holding the wheels on. There are U clamps holding the axels onto the piece of wood. I have a 5lb bag of sugar suspended from a string that is on a 2x4 mounted on the "frame" piece of wood with 2 pullies going to the rear axel. We tested it and it didnt move. If we lift the back tires off the ground, the 5lbs makes the back tires go. Any suggestions on how to get her moving? Thanks..
more weight to overcome the frictional resistance of the axle and impart momentum to the mass of the body ( oops this is outside the rules ! )
to make it more efficient make sure the axles are not in direct contact with the wood ( you don't need ball bearings but a bushing made of metal would help a lot ) ALSO you need to eliminate friction everywhere ( harder tires - rubbing rope -ect ) after that you need to eliminate mass ( weight )
last of all if your 'engine' ( weight ) has a bit of free fall it will overcome the 'stiction' of starting the car ( rig a device that allows drop the more the better )
also you may have a 'gearing ' problem the larger the pulleys the rope works against the less power required ( thing of the sprockets on a 10 speed to get the idea )
wish you luck
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