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					                          March 16, 2009

              Warm - Up
• Why do boats float?
                            Today’s Goal
   I will know that buoyant force is always
     pushing upward


   Today’s Lesson
  1st – Warm –Up
  2nd – Bill Nye Buoyant Force
  3rd - Science Log

Thompson Jr. High: Providing a safe learning community which empowers
students to take responsibility for themselves and reach their full academic
potential.
    Date                                 Date    Points
    Assigned
                           Description   Due


1   3/16                                  3/16    20
               Bill Nye Cornell Notes
               Force Quiz
1. What is the net force acting on the box
   below?



     40 N                    35N
                 Force Quiz
  2. Compare the results of the net forces
     acting on the two boxes below.

                40 N                   40N
                          Box A


40 N               40N
        Box B
              Force Quiz
3. Predict what forces will change when a
   skydivers parachute opens.
               Force Quiz
4. If the Earth’s gravitational force were cut
   in half, how would the game of basketball
   be different?
              Mythbusters
• Forces: Flight Attendant Freefall
           Water Rocket Lab
• Draw a full page picture of the apparatus
  and rocket going into the air (Right Side)
  on the left, explain in detail the forces that
  occurred during the whole launch.
     Rock Climbing Problem
• The carabineer has a maximum load of
  2600 N. If my mass is 77kg. How far can I
  fall before I break the carabineer?
            Fabulous Foldables
• Vocabulary Words:
  •   Force – 1/8 Sheet – picture with Definition on inside
  •   Balanced Force – ¼ sheet – Venn diagram on inside
  •   Unbalanced Force
  •   Static – ½ sheet – riddles on outside
  •   Sliding
  •   Rolling
  •   Fluid
Assignment #38 Force Calculations

• Students – Sorry I will not be here today
  (bad chicken salad). Please do the
  calculations for Mrs. Glass. These will be
  really easy because you already know how
  to do speed calculations. Copy the triangle
  on the next slide to your paper and then
  complete the calculations. - enjoy
Force Calculation Triangle



            Force




     Mass    X      Acceleration
            Assignment #36

             Sneaker Lab
• Question: Which sneakers provide the best
  traction?
            Assignment #36

              Hypothesis
• I think ___________Shoe will require the
  most force to move across the table
  because_____________________________
  ______________
              Assignment #36

               Sneaker Lab
• Procedure
  • Connect a paper clip to a shoe, you may need a
    rubber band
  • Connect the spring scale to the paper clip.
  • Measure the force necessary to first move the
    shoe
  • Measure the force necessary to move the shoe
    across the table at a steady speed
  • Repeat for a total of 3 shoes
               Assignment #36

               Data Analysis
• Create the following
  table

   Sneaker         Static Force   Sliding Force
   Joe’s
   Katie’s
   Tiffany's
              Assignment #36

               Sneaker Lab
• Which shoe required the most force to move
  across the table? Why do you think it was the
  most?
• Which shoe required the least force? Why?
• Did the size of the shoe make a difference?
• How could we account for different shoe styles or
  sizes?
    Rigorous Reading 4 Square
Main Idea        Vocabulary




Who’s Involved   Personal Connection
          Bill Nye Motion
• Bill Nye Motion

				
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