What is a crankshaft? & physics alevel question?
826574
Here is a link which shows you what a crankshaft is. \n\nhttp://en.wikipedia.org/wiki/Crankshaft\n\nSince the question is more about whether you know what SHM is, I'll let you look at the animation and decide for yourself. If you need more help I'll be happy to answer by email, but I'd like you to try and answer this on your own.
458604
Four cycle lawnmower engines have a pint of oil or so that sits below the crank shaft inside the engine.  The crankshaft has a small piece of metal on it so as it turns in a circle it dips into the oil reservoir and splashes the oil around inside the crank case.  This is how the engine lubricates its self.  On the hill section you refer to I am guessing that the motor runs for some time with no oil being splashed around, and it gets really hot especially the valves. My guess is that either the crank seizes or one of the valves and when a valve seizes bad thing can happen.\n\nTwo strokes are mostly impervious to position or tilt of the engine. Two stroke engines have no oil reservoir, instead the oil is mixed into the gas and on its way to the combustion chamber the oil gas mixture lubricates the engine.  I addition there is only one valve (No exhaust valve) called a reed valve, which is similar in operation to a toilet tank valve.  two strokes are light and agile and are used in chainsaws, dirt bikes, leaf blowers, weed whackers, demolition saws.  Basically any where light and flexible is needed.   Unfortunately they are loud, give off more gas emissions, and are smelly. \nTwo stroke is for you,
604852
Here are a couple of web sites that approach this in different ways. \n\nhttp://www.circletrack.com/techarticles/84199/\n\nhttp://www.diracdelta.co.uk/science/source/e/n/engine%20excitation%20mechanisms/source.html\n\nHope these help.
1142512
rotational sensor.. which is basically an inductive prox with a timming circuit to calculate revolutions.
370881
try this website http://www.howstuffworks.com/search.php?search=electrical%20motors%20and%20generators&ref=hpaw&page_ref=http://www.howstuffworks.com/
290214
Its the standard measurement for torque like ft in leght/ it is how many pounds of pressure it can produce  /the chevy duramax diesal can produce 650 Lb-Ft of torque the best in it's calss/ these is one of the things that allows it to pull more easier
1006411
Simple. An engine makes its own power from fuel (usually internal combustion) and a motor takes its power from an external source (usually electricity). Regardless of what others here are saying.
971406
are the Truvativ cranks euro or american. Meaning do the bearings press in or thread in. Generally the first thing to taking the cranks off is loosening just the left side crankarm bolt. This bolt is located at the end of the spindle and generally is a larger 8mm allen bolt. On some occasions you may need to loosen a side pinch bolt as well. Once that is loose you need to remove the arm. Sometimes the arm slides off and other times it doesn't. The best tool to use is a crank arm puller but if that is unavailable you could use a ratchet extension and a hammer. The crank arm puller will thread into the internal threads on the arm and by tightening the crank arm puller you will be pressing the spindle the opposite way forcing the arm off. If you use a bolt and a hammer. be sure to make sure the bolt is large enough to not go inside of the threads of the spindle yet small enough to fit inside the crank arm head. You will just pound towards the spindle and the arm will go the other way, unless of course its a european bottom bracket. In that case you will have to use a crank arm puller because the cups thread in and cannot be pressed out. Once the arm is removed a spanner wrench or a thin screwdriver will take out the threaded european cup if its american and not threaded all you will have to do is tap the cup and bearing out. if you have any questions forward me an email at ashesoverpompeii@yahoo.com
607030
INTRODUCTION TO MOTOR, PULLEY AND BELT\nA motor is a prime mover means it provides power to mechanical system or machines. A motor converts electrical energy into mechanical energy which is transmitted by belt drive to perform some mechanical work. The armature (extension of the rotating part) of a motor is coupled with a shaft by a coupling (coupling is a device which connects two shafts so that if one is rotating, the other also rotates). From this shaft power is transmitted to a distant shaft by belt drive. Separate pulleys are present and keyed (means fixed with shaft so that both shaft and pulley rotate as a whole) to each of the driver and driven shaft and joined by a belt in such a way that if one pulley rotates the other also rotates.\n\nDRIVER AND DRIVEN PULLEY SPEEDS\nLet the driver pulley rotate at 'N1' rpm (revolution per minute) and the driven pulley rotate at 'N2' rpm. If the diameters of the respective pulleys be 'D1' metre and 'D2' metre respectively then we have the relation N1/N2 = D2/D1.\n\nBELT SPEED CALCULATION\nNow, we are in a position to start the belt speed calculation. The surface speed of the driver pulley is given by V1 = pi*D1*N1 metre/minute = pi*D1*N1/60 metre/second. In ideal condition i.e. if no slippage was present then the belt speed would have been equal to the surface speed of the driver pulley i.e. equal to 'V1'. But actually there is aways some slippage between the belt and pulley surface so the speed of the belt is always less than 'V1'. If this slip factor is 's' then the belt speed is (1-s)*V1 \n= pi*D1*N1*(1-s)/60 metre/second.
892108
Its a mechanical device basically used for turning ,tapering of metal,wooden jobs.It can also be used for threading ,offset turning ,boring and drilling of jobs.
348009
CVVT= Constantly variable valve timing.  In a normal engine the valves that let fuel and air into the engine work by a camshaft, each lobe is shaped like this <) and the camshaft pushes the valves open and lets the valves close.  The camshaft is run off a pulley which is attached to the crankshaft via a belt (cambelt) or chain (you guessed it camchain) With a CVVT engine the valves open at diferent rates  ie they can stay open longer, shorter, or wider, depending on how you drive the car (if you thrash it you will cause the valves to open more to allow more fuel and air into the engine and get the exhause gasses out ASAP) As for a DHOC i think you mean DOHC Double overhead cam, going back to the normal engine i mentioned earlier, it just means that you hae 2 camshafts instead of one, engines like this usualy have 16 valves and more, letting in more air/fuel and letting out exhaust gasses quicker making an improvement in economy and performance.  PHEW, if that doesent deserve 10 points then I dont know what does!!!
1115811
Can you be more specific in your question. e.g. what will your equipment do? Are you looking to calculate rotary speeds and forces when compared to static forces. E.g. dynamic forces means you can balance on a bike, or even walk. But static forces are more simple to calculate and are based on Force/Area = Stress.
898942
A crank works with leverage, in general, like a can opener. For the rest of the question, find yourself an electric motor, put some kind of handle on it, get some wire, and a flashlight bulb and hook it all up some how, forget the sand.
534463
All kinds of things. All of a cars mechanisms are based on physical laws. I suppose this is for a school project so it might be enough if you talk about speed, acceleration etc...and maybe about the chemical energy that is being converted to heat energy which is being converted to kinetic energy (in school terms). When going through a curve you can talk about centripetal acceleration etc etc
225971
Actually what you want to build is an electric *motor*, not an electric *engine*.  By definition, an engine has a number of working parts that move sychronously, whereas a motor is a simple moving machine (my English teacher nailed me on this back in the 12th grade and I've never forgotten it).\n\nBut nevermind all that semantics stuff.  See the link below for some excellent how-to examples, depending on how powerful a motor you want to make.\n\nHave fun!
460378
The basic theory is that if you pump steam into a place where there is a piston, the piston will move up.  Then you release the steam and the piston will go down.  You connect the piston to something to get movement, such as some gears that turn the propellers or connect them to the wheels.  It's a bit more complicated than that, but that's basically how it's done.
207863
see:\nhttp://en.wikipedia.org/wiki/EngineerIng