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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 |
| Machines Around Us | Hamza Ahmed Year 8 |
| What is a simple machine? | A machine that makes a task easier |
| What can machines do? | They can: 1. Change the size of a force. 2. Make things speed up. 3. Change the direction of a force. |
| What is effort and load? | Effort is force and load is force required to do the job. |
| How do machines change the size of a force? | Machines can multiply the size of a force, making a task easier, like using a jack to change the tyre. |
| How do machines make things speed up? | Machines make things faster with less effort. Like using an eggbeater, the blades move much faster than the handles. |
| How do machines make things change direction? | Machines mainly use pulleys, like when you pull the cable down and a pulley lifts the blinds up. |
| What are levers? | A lever is a simple machine, made of a long rigid object that rotates on a fulcrum. |
| What do levers do? | They increase the size of effort or reduce if needed making it easier, like using the claw of the hammer to pull a nail out. |
| How do you measure how much easier a machine makes a task? | Mechanical advantage= load ÷ effort |
| What does a machine with mechanical advantage 2 indicate? | 1. Lift twice the load you'd normally lift 2. Use half force needed to do the job |
| How do you calculate the mechanical advantage for levers? | Mechanical advantage = distance from effort to fulcrum ÷ distance from load to fulcrum |
| These two statements can be combined into the principle levers. What is the principle of lever? | Effort x distance (effort to fulcrum) = Load x distance ( load to fulcrum) |
| Levers are grouped into what classes of levers? | First Class Levers Second Class Levers Third Class Levers |
| What is a first class lever? | Levers with the fulcrum positioned between the effort and the load. |
| What is a second class lever? | When the load is positioned between the fulcrum and the effort. |
| What is a third class lever? | When the effort is positioned between the load and the fulcrum? |
| What is the unit used to measure force? | newton |
| Which class of levers multiplies speed? | Third class levers |
| Which class of levers multiplies force? | First class levers and second class levers |
| The End | Thank You |
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