Warm - Up

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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
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?
Main Idea        Vocabulary

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

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