Download Big Enough for a Bike (Sesame Street) by Sesame Workshop PDF

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By Sesame Workshop

Glance out! Zoe is able to journey a motorbike similar to an enormous child! it will probably take a bit perform, yet quickly Zoe learns to journey her tricycle all through herself--zoom zoom!

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Extra resources for Big Enough for a Bike (Sesame Street)

Sample text

THE MECHANICS OF MOVEME T SPUR GEARS DERAILLEUR GEARS The chain connecting the pedals of a bicycle to the rear wheel acts as a belt to make the wheel tum faster than the feet. To ride on the level or downhill, the rear-wheel sprocket needs to be small for high speed. But to climb hills, it needs to be large so that the rear wheel rums with less speed but more fo rce. Derailleur gears solve the problem by having rear-wheel sprockets of different sizes. A gear-changing mechanism transfers the chain fro m o ne sprocket to the next.

Ally. u raise the lower set of pulleys attached to the load. :e, the e£fon has to overcome friction in all the pulleys and raise the weight of the lower set of p 1le)'s as wca as thl! load. This reduces the amplification f)! rhe effort. lfllfleN~- LOWER PULLEY WIIEEL D OUBLE P UllEY In a double pulley system, the load moves only half the distance of the rope pulled in. ~ the distance is ~wived, the force raising the load is double the effort pulling tile mpe. {55] THE MECHANICS OF MOVEMENT CHAIN HOIST he chain hoist cons istS of an endless chain looped around three pulleys.

Effort applied to the wheel, as in the winch, causes the axle to tum with a greater force than the wheeL Many machines use the wheel and axle to increase force in this way. Turning the axle, as in the mammoth drier, makes the wheel move at a greater speed than the axle. 'VCJS, you gain in force what you lose in distance moved. Here the movement of the wheel is Lumed into a shorter but more powerfld movement at the (lX/e. [31] THE MECHANICS OF MOVEMENT THE WHEEL AND AxLE AT WORK SCREWDRIVER The handle of a screwdriver does more than enable you to hold it.

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