Warm Up

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Warm - Up
March 16, 2009

• How can you predict if an object will sink or
  float in a fluid?

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Todays Goal

• I will be able to predict if an object will sink
  or float

Todays 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.
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(No Transcript)
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Buoyancy Cornell Notes
Assignment 2
The Buoyant Force is equal to the amount of water
displaced.
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Buoyancy Cornell Notes

• Archimedes Principle
• The buoyant force is equal to the mass of the
  displaced liquid
• If the mass of the object is greater than the
  mass of water it displaces the object will sink
• If the mass of the object is less than the mass
  of the water it displaces it will float.

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Buoyancy Video

• Daily Planet - Buoyancy

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Force Quiz

• What is the net force acting on the box below?

35N
40 N
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Force Quiz

• Compare the results of the net forces acting on
  the two boxes below.

Box A
Box B
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Force Quiz

• Predict what forces will change when a skydivers
  parachute opens.

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Force Quiz

• If the Earths gravitational force were cut in
  half, how would the game of basketball be
  different?

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Mythbusters

• Forces Flight Attendant Freefall

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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.

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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?

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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

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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

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Force Calculation Triangle
Force
X
Acceleration
Mass
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Sneaker Lab
Assignment 36

• Question Which sneakers provide the best
  traction?

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Hypothesis
Assignment 36

• I think ___________Shoe will require the most
  force to move across the table because____________
  _______________________________

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Sneaker Lab
Assignment 36

• 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

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Data Analysis
Assignment 36

• Create the following table

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Sneaker Lab
Assignment 36

• 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?

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Rigorous Reading 4 Square
Main Idea
Vocabulary
Whos Involved
Personal Connection
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Bill Nye Motion

• Bill Nye Motion