6372849
Description
Flashcards by Rawan Ibrahim, updated more than 1 year ago
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Created by Rawan Ibrahim
about 8 years ago
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| Question | Answer |
| What is a wheel? | A type of lever with an axle acting as its fulcrum. |
| What is an axle? | A shaft on which a wheel rotates. |
| What type of advantage can a wheel provide? | A speed and a force advantage depending on the situation. |
| What is an example of a wheel giving a force advantage? | When you apply force to turn on a tap, the handle acts a a wheel. It increases the force you apply at its center, allowing the spindle or axle to turn. |
| What is an example of a wheel giving a speed advantage? | The motor of an electric fan turns the central axle relatively slowly. This speed is multiplied through the spinning blades. The longer the blades, the greater the speed multiplied. |
| What is a pulley? | A wheel with a groove over which a rope or cable can slide. |
| What is the advantage of using a pulley? | It changes the direction of a force. |
| How do you increase the force applied to a pulley? | You have to use more than one pulley. |
| How does using two pulleys help? | You are reducing the amount of effort needed while applying it over a greater distance. |
| What is the block and tackle arrangement? | A system of two or more pulleys using rope or cable to lift heavy objects. |
| What is a disadvantage of having two wheels connected to each other by a belt. | The belt could slip. |
| How can this be avoided? | You can use gears, or cogs to transfer spinning motion. |
| What are gears? | A wheel with teeth used to turn another gear wheel. |
| How can gears be joined together? | They can be meshed directly together or be joined by chain. |
| What is a gear train? | A system of interconnected gears. |
| What happens to one gear when the other spins? | The first one spins in one direction while the second one spins in the other direction. |
| What is the driving gear? | The gear that supplies force to another gear. |
| What is the driven gear? | The gear that receives force from a driving gear. |
| When are gears used as force multipliers? | When the driving gear is smaller than the driven gear, the combination act as a force advantage. |
| At which speed at the two cogs rotating? | The smaller cog will rotate quicker than the larger cog but the larger cog will turn more slowly but the force it has would be more larger. |
| When is using this gear combination useful? | When a car is going up a hill or help in using a wench. |
| When are gears used as speed multipliers? | When the driving gear is larger than the driven gear. |
| When is using this gear useful? | When you are using an eggbeater. |
| What are sprockets? | A toothed wheel used to link onto a chain on a bicycle. |
| How do you use first gear? | You select the largest rear-wheel sprocket and the smallest chain wheel sprocket. |
| How do you use highest gear? | You select the smallest rear wheel sprocket and largest chain wheel sprocket. |
| Hope you learned something :-) |
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