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Wheels, Pulleys and Gears

Hamza Ahmed Inglés 20 fichas

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1Wheels, Pulleys and GearsHamza Ahmed Year 8
2What are wheels?A type of lever with its fulcrum as the axle
3What do wheels act as?Force multipliers and speed multipliers
4What is the axle?The centre of the wheel on which it rotates
5What is the rim?The outer edge of a wheel
6How does the wheel work?It takes more force to turn the axle and less speed, but less force for the rim but more speed.
7How can you increase the distance covered by the wheel?You increase the circumference of the wheel
8How do electric fans work?The axle is turned slowly but the force is multiplied by the spinning blades
9What is the history of the wheel?The first wheels were not used for transportation. They were first made to serve as potter's wheels around 3500 B.C. in Mesopotamia.
10What are pulleys?A wheel with a groove over used to change the direction of a force
11How do you increase the force applied to a pulley?You need to use more than one pulley
12What happens if you use 2 pulleys?It halves the force needed, gives a mechanical advantage of 2
13How can you produce a greater mechanical advantage?You can use a number of pulleys in an arrangement called the bock and tackle
14What is the block and tackle arrangement?An arrangement using 2 or more pulleys and a rope or cable to lift heavy objects
15What are gears?A wheel with teeth around the edge or rim
16What are gears interlocking together called?Gear trains
17How do gears work?One gear turns and turns the interlocking gear but in the opposite direction
18What is the gear that supplies the force is called?The driving gear
19What is the gear that is connected to the driving gear called?The driven gear
20How do you find out the gear ratio?The number of teeth on the driving gear
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the number of teeth on the driven gear