Works and Machines Questions page 81

1)The parts of a pulley are hub (or boss), the arms (or spokes) and the rim.
2) It is easier to use a pully system because the car engine would be very heavy to lift its easyer to pull a rope then lift it.
3) The Chain on a bike moves all the gears together once the pedals are used the gears move the wheels.
4) The Differance of high and low gear is low gear, the difference is the power (work/time). in High gear you need to pedal with more power.
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