1. Sink or Float – With a Twist
Donnika Jones – Bear Creek Elementary
Pat Van Driessche – Douglas Jamerson Elementary

2. Sink or Float? Sink or Float? Watermelon and Grape
Uncovering Student Ideas in Primary Science, p. 45
Watermelon and Grape
Uncovering Student Ideas in Primary Science, p. 49
Science Notebooks or Handouts
“Toss and Talk” Strategy (Keeley)

3. Sink or Float?
Predict which objects will sink and which will float. Test each object and record the result.
Object
Prediction
Result
Wooden sphere
Metal sphere
Paper clip
Packing peanut
Rubber ball
Penny
½ Bar of Clay
Science Notebooks – Make chart
Small Tubs with Water, 7 objects (per group)
Find text to support
Based on your observations, describe the properties of an object that cause it to sink or float.

4. Sink or Float? Design a Flinker www.pbskids.org/zoom
How did you change the packing peanut to make it flink?
What other materials could you make flink? How?
What makes an object sink or float? (Write)
Flinker Handout, Science Notebooks
Small tubs with water, packing peanuts, paper clips, corks, metal washers

5. Sink or Float? How can an ocean liner made of steel float on water?
Answers to Science Questions from the Stop Faking It! Guy, p. 125
After reading the article, refine your response:
Describe the properties of an object that cause it to sink or float.
Copies of article per person
Use discussion to refine thinking about what makes an object sink or float. Refer back to written responses from Slide 37.

6. Buoyancy - Fourth Grade
Gravitational force acting on objects with various surface area integrated with Natural Resources Unit
Calculations for volume, surface area, buoyancy
Free body diagrams, vectors, loads, redesign for constraints

7. Engineering Design Challenge… Design a Native American Dugout
You may use 1 bar of clay.
The dugout must float.
The dugout must hold the greatest possible number of marbles before sinking.
What attributes of the boat designs enabled them to hold more force?
How can you use a scalar other than marbles to calculate the amount of force held prior to failure?
Clay, Marbles, Tubs of Water
Spring Scales

8. Calculating Buoyant Force

9. Next Generation Science Standards
K-2-ETS1-2.
Develop a simple sketch, drawing, or physical model to illustrate how the shape of an object helps it function as needed to solve a given problem.
K-2-ETS1-3.
Analyze data from tests of two objects designed to solve the same problem to compare the strengths and weaknesses of how each performs.
2-PS1-1.
Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
These standards for covered to mastery throughout several years, not in one particular unit or challenge.
2-PS1-2.
Analyze data obtained from testing different materials to determine which materials have the properties that are best suited for an intended purpose.

10. Florida Science Standards
SC.K.P.8.1
Sort objects by observable properties, such as size, shape, color, temperature (hot or cold), weight (heavy or light) and texture.
SC.1.P.8.1
Sort objects by observable properties, such as size, shape, color, temperature (hot or cold), weight (heavy or light), texture, and whether objects sink or float.
SC.2.P.8.1
Observe and measure objects in terms of their properties, including size, shape, color, temperature, weight, texture, sinking or floating in water, and attraction and repulsion of magnets.
These standards for covered to mastery throughout several years, not in one particular unit or challenge.
SC.3.P.8.3
Compare materials and objects according to properties such as size, shape, color, texture, and hardness.
SC.4.P.8.1
Measure and compare objects and materials based on their physical properties including: mass, shape, volume, color, hardness, texture, odor, taste, attraction to magnets.