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BicyclesMany machines usegears. A very goodexample is a bicycle whichhas gears that make iteasier to cycle, especiallyup hills. Bicycles normallyhave a large gear wheelwhich has a pedalattached and a selectionof gear wheels of differentsizes, on the back wheel.When the pedal isrevolved the chain pullsround the gear wheels atthe back.26
First time out, gears can be intimidating.Especially if mechanical gizmos do notweigh heavily in your background. AndBike gears are gizmos in every sense ofthe word.I'm going to talk about gears as "hard"or "easy" instead of "big" or "small".This is because "Big Gears" meansdifferent things, depending on where thegear is. A Big Gear in in back (at therear wheel) is an easier gear. A BigGear in front (at the pedals) is a hardergear.A hard gear is difficult to pedal, but yougo farther and faster with every turn ofthe crank.An easy gear is, well, easier to pedal,but you go slow, and each turn of thecranks only moves the bike a little ways.27
Page 4: Pawl and ratchetA ratchet mechanism
Page 8 and 9: Meshed GearsThe diagram below shows
Page 10 and 11: 2) Dividing the diameter of the fol
Page 12 and 13: ExercisesLook at the image on the l
Page 14 and 15: Gear ratios and simple gear trainsW
Page 16 and 17: What is the Gear ratios of these Ge
Page 18 and 19: a 20-tooth follower will turn three
Page 20 and 21: Working out revolutions per minute
Page 22 and 23: Working out revolutions per minute
Page 24 and 25: Question 1For every revolution of t
Page 28 and 29: Highest gear: (downhill) is the lar
Page 30 and 31: Changing the angle of motionBevel g
Page 32 and 33: Movement of the rack & pinionNote:
Page 34 and 35: The Wheel Although they may seem ve
Page 36 and 37: To understand torque you need to kn
Page 38 and 39: Gear torque rules:Torque is a turni
Page 40 and 41: A simple gear train consists of two
Page 42 and 43: Mechanical AdvantageWhen two gears
Page 44 and 45: Question 1Look at the imageon the l
Page 46 and 47: Answers p 12:46
Page 54 and 55: 1. Bevel Gears:a. Have teeth parall

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