6092645
Description
Flashcards by Ahmed Almohammed, updated more than 1 year ago
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Created by Ahmed Almohammed
over 8 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. |
| How can simple machines make tasks easier? | Simple machines make tasks easier in 3 different ways. It can -: -Change the size of a force -Make things speed up -Change the direction of a force |
| What are effort and load? | To get a job done, you apply a force called an effort. The load is the force actually required to do the job. |
| Why do we use force multiplier frequently? | Machines used in this way magnify the force you apply to do a job, making the task easier and the effort required smaller. |
| What is the useful reason for using speed multipliers? | We use speed multipliers when we want to produce a large amount of a load while applying a small amount of effort. |
| How can a machine change the directions in which a force acts? | Using a pulley, you pull the cables down and a pulley changes the direction of the force on the blinds to lift them up. |
| How do levers make the jobs easier? | A lever, which is a simple long rigid stick (like a crowbar), increases the size of the effort that you can apply or reduces the effort needed, making the jobs easier.Therefore, the lever increases the force that you can apply. |
| Give an example of when a lever becomes a useful material in some cases. | Using the claw of a hammer to pull a nail out of a wood, the hammer acts as a lever which reduces the size of the effort needed to pull out the nail.This makes the task much easier than doing it with your hand. |
| How can you measure how much easier a task became? | You can measure how much easier a task has become by calculating the mechanical advantage a machine produces. |
| What does a machine with a mechanical advantage allow you to do? | It allows you to -: -Lift twice the load you would probably be able to lift -use half the force you would have otherwise needed to do a particular job. |
| A worker applies an effort of 100N to lift a rock of weight 300N using a wheelbarrow. Calculate the mechanical advantage of the wheelbarrow. | |
| Why is it easier to open a tin with a longer screwdriver? | It is easier to open a tin using a longer screwdriver because it has a greater distance from the fulcrum to the effort. |
| What does the principle of levers rule states about calculating mechanical advantage? | |
| What is the formula used to calculate the mechanical advantage for a lever? | |
| What are the three different types of levers? | |
| What is the first-class lever? | A first-class lever has its fulcrum positioned between the effort and the load.These levers act as a force multipliers.The greater the distance between the fulcrum and the effort, the greater the mechanical advantage of the lever. |
| What is second-class lever? | A second-class lever has the fulcrum located at one end, the effort at other end and load in the centre. |
| What is a third-class lever? | A third-class lever has the fulcrum located at one end, with the load at the other and effort in the centre. |
| Classify the following as first, second or third class lever <----------- | A wheelbarrow is an example of a second-class lever. |
| A scissor is an example of a first-class lever. |
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