Science Class

1. Hydraulic Reading- go to teacher page select Hydraulic reading, read article and answer questionsfor the reading.

2. Finish the following: These are posted on my webpage for Dec 12 work.webquest machines wks,Cosi Lever wks

Crossword puzzle

3. Measure up books- complete wks on machines

4. Study Island Machines study guide- go to study island and complete the study guide

5. Study Guide - paper copy—work on this and be ready to discuss on Friday.

Test Monday 12/17

N^^e. ?(̂Hydraulics Questions

1. Why are liquids a good choice to use for hydraulics?

2. Summarize, in your own words, how a water pistol works?

3. Draw figure 1 on page 4 of packet below and label the input and oyt^LrLforce.

4. Use the figure you drew above to explain how hydraulics is essentially just awater pistol working in reverse.

5. Pressure s ForceArea

Based on the pressure equation above, what will happen to the pressure if youincrease the Force applied? (hint: think about squeezing a water bottle harder)

Based on the pressure equation above, what will happen to the pressure if youincrease the area? (hint: think about opening up the end of garden hose sprayerwider)

Name: Period :

A Simple Machines Webquest ReviewObserve: How do Simple Machines help us to do WORK?

Visit each of the following sites to review this content to answer the questions that follow.GOTO. http://teacher.scholastic.com/dirtrep/Simple/invest.htm

1) Simple machines are so "SIMPLE" because they what?

2) In science, "work" means

the amount of FORCE / EFFORT3) A simple machine helps us by_needed to move something.

CLICK the link on the RIGHT for a TYPE OF SIMPLE IVIACHINE & Complete the CHART:Simple machine HOW IT HELPS US: 2 Examples:Inclined Plane .The effort (force)

the distance.1.2.

Wedge Works like a . Thenarrower the wedge, the_theFORCE, but the greater the

.you have to push it!

1.

2.

Screw The thinner the thread on the screw, thethe force needed but

the the distance.

1.2.

Lever Changing the position of theincreases or

decreases your effort_

1.2.

Wheel & Axle The bigger the wheel, thethe effort. The axle can be like a

in a lever.

1.2.

Pulley Increasing the # of pulleys increasesthe _ _ _ but decreasesthe amount of, applied

1.2.

GOTO: http://www.enchantedlearninQ.com/phvsics/machines/Levers.shtml

1. Label the type of LEVER as First, Second or Third class lever.2. Label the EFFORT, LOAD and FULCRUM in each drawing.3. Write TWO examples for each type of lever.

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TYPE: TYPE: TYPE:

Examples: Examples: Examples:

GOTO: h tip './/www. the-office.com/summerlift/pullevbasics. h tmRead about the different kinds of pulleys and answer these questions:

1. A pulley is usually made of a rope, belt or chain that changes the.the force to lift an object.

2. A disadvantage of a fixed pulley is that when used individually, uses morethan the load to lift it.

and uses

of

effort to lift3. A movable pulley moves with the_the load.

4. Although a combined pulley decreases the effort needed to lift the load to less than_the weight of the load, it also increases the

GOTO: http://www.cosi.ora/downloads/activities/simplemachines/sm1.html

Click "It's all About Mechanical Advantage"

1. The efficiency of any machine compares the work that comes out of it, called the., to the work that goes into it, called the

The mechanical advantage of a machine tells us how much a machine CHANGES theamount of FORCE you put in compared to how much FORCE the machine puts out.

A compound machine is a device made up of more than one simple machines.

GOTO. http://www.cosi.orci/downloads/activities/simplemachines/sm2.html

Read and find ALL the simple machines in the lawnmower and submit your answers to seeif your right!

GOTO: httD://www.auia.com/pop/36483.html?AP rand=472441267 & QUIZ Yourself!What was your score? _ out of 22. If you made less than 15, please redo thequiz.

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^ Name Ulockpg.-Simple iVTachine Review1. Go to yoogle and type in: "cosi simple machine"2. select the first link

3. or type in: vvww.cosi.orp/fiIes/FIa<shAimpMach/sml.swf4. Click on the picture of a lever5. click next ....____._.-...-....-—-,.-...—--—1-.—-'"•—-—"6. undcr'*m6re levers" elicit continue7. What is in the middle of a 1 '* class lever?8. Draw the seesaw and label the fulcrum, effoit, and resistance

9. click next

10. What happens to the effort force when you move the fulcrum closer to the effort?11. What happens to the efFort force when you move the fulcrum closer to the resistance?12. List some common examples of 1 class leven.I J. click continue14. What is in the middle of a 2"d clasa lever?15. click next •16. Draw and label the picture with fiilcrum, effort, and resistance.

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17. click next.

18. List some common examples of 2 class levers.19. click continue20. What is in the middle of a 3rd class lever?21. click next22. Draw and label the picture F,R,E

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23. click next

24. List some common examples of31d class levers.25. Go back to the home page and select "Putting simple machines to work" at the bottomof the page.

26. Go through and build the tree house, show the finished tree house to the teacher. ^>.

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|9 ii Simple Machines Crossworda

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Aarof2. the forco applied by th« machine to overconr reniatanca.4. Worlt equal* force x5. a machina conaiating of wha<il« of two aizea rotating together.6. A machine with mor«^ ^^ ^ . doea thai aam* amount of work In lesa tima.12. machina that doc« work with only one roovnnent.13. a grooved whaal with a rop», chain, or cabl» runnlngr along tha graav.14. a sloping aurfaca that reducea tha amount of Corca needed to do'work.15. tha force applied to the mactaina.16. th» number of timaa th« machine multiplies the effort forcn.Down

1. tha fcranafer of energy that occura to mak» something move.3. tha clasa of lever wher» the effort forcu ia batween th« resistance forca andth« fulcnua.

7. a meaaura of how much of tha work; put into a machine is changed into usafuloutput work by tha mactalna.8. a machina made up of simple machines.9. an inclined pla.ae with ana or two gloping side*, change* the direction of thaeffort forca.

10. an inclined plang wrapped in a spiral around a cylindrical post.11. a bar that is free to pivot or turn aboufc a fixed point.

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Chapter 5: Work and Simple Machines (pg 126-146)Key Vocab Words (define each)

1. work-

2. power-

3. machine-

4. effort force-

5. resistance force-

6. mechanical advantage-

7. efficiency-

8. simple machine-

9. compoimd machine-

Essential Questions ~ ..— „ -.._ __

What is the meaning of work? (include the equation for work in yourexplanation)

How do machines make work easier?

• How do you calculate mechanical advantage?

easier) ^Describe the 6 types of simple machines, (mclude how each makes work

Reading Check Questions: \..

1. What must you ask to determine if work is being done?

2. How is power related to work?

3. How does a ramp make lifting an object easier?

4. What is the efficiency of a machine?

5. All simple machines are variations of what two basic machines? v^

6. How does a moveable pulley multiply the effort force?

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