6093061
Description
Flashcards by Rawan Ibrahim, updated more than 1 year ago
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Created by Rawan Ibrahim
over 7 years ago
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| Question | Answer |
| What do simple machines do? | Simple machines change the size, direction or speed of a force to make a job easier. |
| What are some examples of simple machines? | Levers, inclined planes, ramps, wedges, screws, pulleys, wheels and gears. |
| What is effort? | Force applied to a lever to overcome a load. |
| What is the load? | Force that the lever is used to overcome. |
| What is a simple machine? | A device that makes work easier by changing the size or direction of a force |
| What are the three ways a simple machine makes a task easier? | - Change the size of a force - Make things speed up - Change the direction of a force. |
| What are force multipliers? | |
| What is an example of a force multiplier? | Using a jack makes the task of replacing a tire on the car easier. |
| What are speed multipliers? | Machine that requires a small movement of an effort to produce a large movement of a load, such as a third-class level. |
| What is an example of a speed multiplier? | When using an egg beater to whip cream, the blades move much faster than the handle. |
| What is an example of changing the direction of a force? | Using a pulley to pull the blinds up instead of actually having to push the blinds up. |
| What are levers? | They are simple machines that are made up of a long, rigid object and a pivot about which it rotates |
| What is a fulcrum? | It is a point which a lever pivots. |
| What do most levers do? | They increase the size of the effort you can apply or reduce the effort needed, making the job easier. |
| What is a mechanical advantage? | It is the ratio of a load force to the effort force used by a machine. |
| The way a lever operates depends on three things. What are they? | The position of the effort, load and fulcrum. |
| What is a first-class lever? | Lever with effort and loads located at each end, and fulcrum in the center. |
| What is a second-class lever? | Lever with the fulcrum located at one end, the effort at the other and load in the center. |
| What is a third-class lever? | Lever with the fulcrum located at one end, with the load at the other and effort in the center. |
| What are some other examples of third-class levers? | Tweezers and tongs. |
| Enjoy... |
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