6255909
Description
Flashcards by Hamza Ahmed, updated more than 1 year ago
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Created by Hamza Ahmed
over 9 years ago
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| Question | Answer |
| Wheels, Pulleys and Gears | Hamza Ahmed Year 8 |
| What are wheels? | A type of lever with its fulcrum as the axle |
| What do wheels act as? | Force multipliers and speed multipliers |
| What is the axle? | The centre of the wheel on which it rotates |
| What is the rim? | The outer edge of a wheel |
| How does the wheel work? | It takes more force to turn the axle and less speed, but less force for the rim but more speed. |
| How can you increase the distance covered by the wheel? | You increase the circumference of the wheel |
| How do electric fans work? | The axle is turned slowly but the force is multiplied by the spinning blades |
| What 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. |
| What are pulleys? | A wheel with a groove over used to change the direction of a force |
| How do you increase the force applied to a pulley? | You need to use more than one pulley |
| What happens if you use 2 pulleys? | It halves the force needed, gives a mechanical advantage of 2 |
| How can you produce a greater mechanical advantage? | You can use a number of pulleys in an arrangement called the bock and tackle |
| What is the block and tackle arrangement? | An arrangement using 2 or more pulleys and a rope or cable to lift heavy objects |
| What are gears? | A wheel with teeth around the edge or rim |
| What are gears interlocking together called? | Gear trains |
| How do gears work? | One gear turns and turns the interlocking gear but in the opposite direction |
| What is the gear that supplies the force is called? | The driving gear |
| What is the gear that is connected to the driving gear called? | The driven gear |
| How do you find out the gear ratio? | The number of teeth on the driving gear ÷ the number of teeth on the driven gear |
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