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| Questão | Responda |
| WHEELS, PULLEYS AND GEARS UNIT 1.3 | OPAL KHAN |
| What is an axle? | An axle is a shaft on which a wheel rotates. |
| What is a wheel? | A wheel is a type of a lever with an axle acting as its fulcrum. |
| What is a rim? | A rim is the outer edge of a wheel. |
| What is a pulley? | A pulley is a wheel with a groove over which a rope or cable can slide. |
| What is a pulley used for? | A pulley is used to change the direction of a force. |
| How can the force applied be increase? | The force applied can be increased by using more than one pulley. |
| How can a greater mechanical advantage be produced? | A greater mechanical advantage can be produced by using a number of pulleys. |
| What is block and tackle? | Block and tackle is a system of two or more pulleys using rope or cable to lift heavy objects. |
| In older-style machines, what was one wheel connected to another by? | In some older-style machines such as lathes, one wheel is connected to another by a rubber belt. |
| What did the belt do? | The belt transfers the spinning motion of the first wheel to the second. |
| What is one disadvantage with such a system? | One disadvantage with such a system is that the belt can slip. |
| How is this problem avoided? | This problem is avoided by using gears, or cogs to transfer the spinning motions. |
| What are gears? | Gears are a wheel with teeth used to turn another gear wheel. |
| What is the most common type of gears? | The most common type of gears are called spur gears. |
| What is a gear train? | A gear train is a system of interconnected gears. |
| What is the driving gear? | The driving gear is the gear that supplies force to another gear. |
| What is the driven gear? | The driven gear is the gear that receives force from a driving gear. |
| How can a gear be a force multiplier? | If the driving gear is smaller than the driven gear, then the combination acts as a force multiplier. |
| How can a gear be a speed multiplier? | If the driving gear is larger than the driven gear then the combination acts as a speed multiplier. |
| What are some different types of gears? | Some different types of gears include: -Bevel gear -Worm gear -Rack and pinion -Idler gear |
| What is a sprocket? | A sprocket is a toothed wheel used to link onto a chain on a bicycle. |
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