Levers+&+Pulleys

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 * ==**Vocabulary** ==

Key vocabulary words for this unit:

 lever  newtons  pulley  diagram  load  class-1 lever  effort  class-2 lever  advantage  class-3 lever  diagrams  simple machine  lever arm  fixed pulley <span style="font-family: 'Comic Sans MS',cursive;"> fulcrum <span style="font-family: 'Comic Sans MS',cursive;"> movable pulley <span style="font-family: 'Comic Sans MS',cursive;"> mechanical advantage <span style="font-family: 'Comic Sans MS',cursive;"> directional advantage

<span style="font-family: 'Comic Sans MS',cursive;"> Go to Quizlet and play the Scatter Game to improve your understanding of the key vocabulary <span style="font-family: 'Comic Sans MS',cursive;"> listed above.

<span style="font-family: 'Comic Sans MS',cursive;"> [|Quizlet] || ==<span style="font-family: 'Comic Sans MS',cursive;">**Websites** ==

<span style="font-family: 'Comic Sans MS',cursive;">Check out these websites related to levers & pulleys:

<span style="font-family: 'Comic Sans MS',cursive;"> Click on simple machines and test your understanding of the seven simple machines <span style="font-family: 'Comic Sans MS',cursive;"> [|Edheads]

<span style="font-family: 'Comic Sans MS',cursive;"> Build a trebochet, which is a form of lever, on this site <span style="font-family: 'Comic Sans MS',cursive;"> [|Trebochet]

<span style="font-family: 'Comic Sans MS',cursive;"> Check out the levers & pulleys activities on our FOSS website. Click on Build a Rube Goldberg Machine on the left side of the page <span style="font-family: 'Comic Sans MS',cursive;"> [|FOSS]

<span style="font-family: 'Comic Sans MS',cursive;"> See if you can figure out to make the compound machine complete the task. <span style="font-family: 'Comic Sans MS',cursive;"> [|Goldburger To Go]

<span style="font-family: 'Comic Sans MS',cursive;"> Help Twitch use simple machines to complete the tasks. <span style="font-family: 'Comic Sans MS',cursive;"> [|Simple Machines]

<span style="font-family: 'Comic Sans MS',cursive;"> Use a variety of simple machines at a skatepark to test out your knowledge and understanding of levers, wheels & axles, screws, and gears. <span style="font-family: 'Comic Sans MS',cursive;"> X-treme Rotation ||
 * ==<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">**Key Concepts** ==

<span style="font-family: 'Comic Sans MS',cursive;"> Simple machine provide advantage to the user.

<span style="font-family: 'Comic Sans MS',cursive;"> The closer the load is to the fulcrum the easier it is to lift the load.

<span style="font-family: 'Comic Sans MS',cursive;"> The greatest advantage is gained if the load is close to the fulcrum and the effort is applied as far from the fulcrum as possible

<span style="font-family: 'Comic Sans MS',cursive;"> A class-1 lever has the fulcrum between the load and the effort

<span style="font-family: 'Comic Sans MS',cursive;"> A class-2 lever has the load between the effort and the fulcrum

<span style="font-family: 'Comic Sans MS',cursive;"> A class-3 lever has the effort between the fulcrum and the load

<span style="font-family: 'Comic Sans MS',cursive;"> A single fixed pulley provides an advantage of change of direction

<span style="font-family: 'Comic Sans MS',cursive;"> A single movable pulley can lift a load using half as much force as a single fixed pulley

<span style="font-family: 'Comic Sans MS',cursive;"> You can predict the effort needed to lift a load by counting the number of ropes supporting the load

<span style="font-family: 'Comic Sans MS',cursive;"> "You never get something for nothing" when effort decreases the distance you pull the rope increases || ==__**<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Questions **__==

<span style="font-family: 'Comic Sans MS',cursive;"> What are the parts of lever?

<span style="font-family: 'Comic Sans MS',cursive;"> How can a lever make work easier?

<span style="font-family: 'Comic Sans MS',cursive;"> Give an example of each of the three classes of levers.

<span style="font-family: 'Comic Sans MS',cursive;"> Explain how my daughter could lift me using a lever.

<span style="font-family: 'Comic Sans MS',cursive;"> What is the relationship between the position of the load and fulcrum?

<span style="font-family: 'Comic Sans MS',cursive;"> When would you use a fixed pulley?

<span style="font-family: 'Comic Sans MS',cursive;"> When would you use a movable pulley?

Using a pulley system, how much effort would be needed to lift a 100 gram mass if 2 ropes were supporting it? 5 ropes? 10 ropes? ||
 * ==**<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Application Questions **==

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Draw two examples of a class-1 lever and label all four parts of the lever system. <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> Include arrows to show the direction of the force. <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Draw two examples of a class-2 lever and label all four parts of the lever system. Include arrows to show the direction of the force. <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Draw two examples of a class-3 lever and label all four parts of the lever system.Include arrows to show the direction of the force || = = =<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">Watch these three video clips on Levers & Pulleys = =<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">and answer the questions below each clip = = =

media type="youtube" key="Us2KfO_yrPA?feature=player_detailpage" height="360" width="640" <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">1. What is the pivot point on a lever called?

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 2. How can you balance objects of different masses? Explain.

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 3. Using a lever, what is the relationship between effort and distance?

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 4. What did Archimedes say about moving the world? Explain.

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 5. List two specific examples of how a lever can be used.

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<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 1. What are the three arrangements of lever?

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 2. List two examples of each of the three arrangements (classes) of lever and explain why they are in fact that class of lever.

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<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;">1. What kind of advantage did Jack and Jill need to get the bucket out of the well? <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> Explain how Jill got the water out of the well easier than Jack.

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 2. Which pulley gives the most advantage? Explain why.

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 3. When would it be necessary to use a single fixed pulley? Explain why

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 4. What is the cost of using Jill's pulley? What does she give up? Explain.

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 5. List two specific examples of how a pulley can be used?

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> media type="youtube" key="FKEpbHesT18" height="344" width="425"

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 1. Why is the girl pulling a lot, but only moving the log a little?

<span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> 2. Is this the strongest girl in the world? Explain your answer.

= Mass vs Weight =

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Where Do Good Ideas Come From?

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