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The Lever

Page history last edited by Laura Jacoby 5 years, 2 months ago

 

The Lever:

We have done a lab in class looking at the lever.  In your activity you found that by moving the fulcrum closer to the load you needed less force to move the load.  Here are some homework activities to further explore the lever, a simple machine.

 

Try to balance Pic and Harry on the see-saw - be patient as it takes a few seconds for them to sort themselves out!

Here are some more sites about levers - 

 

Homework:  Please read the instructions and then complete the questions.  Don't assume that you know what needs to be done without reading!!!

Do the activity , answer the questions written in orange and give me your answers in an organized manner (print them out, or hand write them, or email me ljacoby@parkschool.net).  Please read the instructions carefully and make sure that you know what you need to do before you start!

 

Try out this lever! 

     1.  Put the fulcrum (the rock) as close to the load (the rectangular block) as possible.  Follow the directions at the site about how to move the fulcrum.  Then move the fulcrum away from the load in short steps, collecting at least 5 data points.

     2.  After you collect your results answer the three questions written in orange:

               a.  As the fulcrum get farther away from the load, what happens to the force Harry needs to move the block? 

               b.  When you move the fulcrum father away from the block of stone (load) what is the  exact distance when Harry can no longer move the block (when the force get too big for him to do the job)?

 

In class we made a first class lever; a lever where the fulcrum is between the force (effort) and the load.  We looked at lots of tools that were different classes/types of levers.

 

Check out this site about levers or these pages about first class levers, second class levers, and third class levers.

                c.  In a  2nd class lever the load lies between the fulcrum and the force (effort).   An example is a wheelbarrow:  the load lies between the wheel (fulcrum) and the handles (where the force/effort is applied).  Find two more examples of second class levers and include these in your answer.

               d.  In a 3rd class lever the force/effort is applied between the fulcrum and the load.  An example is a broom. 

Email me ljacoby@parkschool.net with your answers!

 

Does you final homework assignment have the following:

The answers to questions 2 a & b & c?

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