Exit Pass - Lesson 1

An Exit Pass allows your teacher to gather information about your learning in an informal manner. These activities are mandatory but they are NOT worth any marks.

 Notebook

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  2. Complete the activity and save to your Machine Notebook. 
 

Check Your Answers


1. What is the difference between a simple lever and a complex lever?
  • A simple lever has one arm, a fulcrum and a load.  The effort force is applied in one direction.
  • A complex lever has two lever arms, connected by a fulcrum.  The effort force is applied in two directions (think: squeezing on a pair of pliers).
    2. You and a friend have exactly the same weight, and are playing on a teeter-totter. This teeter-totter has very long seats. You decide to move so that you are much closer to the fulcrum than your friend is. Will it be easier of more difficult for your friend to lift you into the air? Explain
    • It will be easier for your friend to lift you.  Since the load (you) is now closer to the fulcrum, your friend will move further up and down than you will.  This means that your friend will use less force, over a longer distance to move you, than before.  Check out the BrainPOP Levers video (username: 0099   password: students) and see what happens with Moby and Tim, if you need a visual reminder of this.

    3. Most of the time, carpenters use a common hammer to pound nails into wood. However, sometimes, the carpenter flips the hammer over and uses it to remove nails. Considering this, are hammers used for a speed advantage or a force advantage? Explain.
    • When swinging a hammer, it is being used as a class three lever.  Class three levers give you a speed advantage.  However, when you flip the hammer over to take out a nail, you move the fulcrum, turning the hammer into a first class lever.  First class levers give you a force advantage