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Description
Flashcards by Hamza Ahmed, updated more than 1 year ago
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Created by Hamza Ahmed
about 8 years ago
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| Question | Answer |
| Inclined Planes | Hamza Ahmed Year 8 |
| What are inclined planes or ramps? | A sloping ramp up which heavy loads can be lifted. |
| What do ramps do? | It makes us use much less force to do a very difficult task but with more distance to cover. |
| What is an example of a ramp? | A winding road up a hill, it makes the journey much safer when going down but increases distance. |
| What are wedges? | A piece of wood, metal, etc. having one thick end and a thin, sharp edge, which drives between an object to separate it. |
| What are wedges used for? | They're used for splitting objects, like cutting down trees or biting into an apple. |
| What are some examples of wedges? | |
| What makes a wedge more productive? | The sharper and the longer it is |
| How do you work out the mechanical advantage of a ramp? | Mechanical advantage= Length of slope ----------------------- height of slope |
| A crate on a 10 m ramp is pushed into a doorway 2 m above the ground. What is the mechanical advantage | 10 ÷ 2 = 5 Mechanical advantage = 5 |
| What are zips? | A simple machine consisting of two strips of metal or plastic with interlocking projections. |
| What are some examples of zips? | Clothing, purses and wallets |
| How do zips work? | A central wedge unlatches the teeth as the zip is undone and side wedges force the teeth together when the zip is done. |
| What are screws? | A spiral shaped inclined plane |
| What are some types of screws? | Wood screws Air propeller screws Boat propeller screws |
| What are they used for? | Wood screws are for cutting timber Air propeller screws are for cutting air Boat propeller screws are for cutting water |
| How do screws work? | As a screwdriver turns a screw, the material moves a long the spiral ramp. The spiral is called the thread. |
| What is a small pitch? | When the threads are much closer to each other, needing more turns, less force. |
| What is a large pitch? | When there's a lot of space between the threads, less turns, more force. |
| The End | Thank You |
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