# Simulation Phet Density FHJH.docx - inetTeacher by cuiliqing

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```									Student Name:______________________                                                 Date:___________

Student Guide for Exploring Floating and Sinking

You will be using a computer simulation to investigate why some objects float and why some sink in
water. Before you begin, answer pre-lab questions.

1. Pre Lab Questions
This picture shows a large block that sinks in the water, and a much
smaller block of the exact same material sitting outside of the water.
A. On the picture, draw what you think would happen if you put the
smaller block into the water.
B. Would it float or sink? Explain your reasoning.
_____________________________________________________
_____________________________________________________
______________________________________________________________
C. The density of the smaller block is _________________________ the density of the
larger block.                      (smaller than, same as, larger than)

2. Simulation Lab Data Table
A. Click on the Run Now! button of the Phet Density simulation on your computer.
B. Select ‘Custom’ from the Blocks box.
C. Select ‘Material’ from the box on top left.
D. The arrow next to ‘Material’ gives you a list of objects.

E. Fill the data table for all the objects.
Object     Mass        Beginning          Ending         Volume of            Prediction     Observation
(kg)       volume of          volume of      object (L)          (Float/Sink)
water (A)          water after    ( difference B-A)
dropping
object (B)
3. Exploring different materials and different sizes.

A. Move the green triangle for Volume left or right.
Does the object’s Mass change? ________________________________________________
Explain why this makes sense:
___________________________________________________________________________
___________________________________________________________________________
Does its Density change? ______________________________________________________
Explain why this makes sense:
___________________________________________________________________________
___________________________________________________________________________
Does floating or sinking change? ________________________________________________
B. A large block that just floats in the water. If a much smaller block of the exact same
material is then placed in the water, It will ____________ (float/ sink)
Explain
______________________________________________________________________________
______________________________________________________________________________
C. What do the floating objects have in common?
___________________________________________________________________________
___________________________________________________________________________
D. What do the sinking objects have in common?

______________________________________________________________________________
______

Design your own block!

F. Click on the Run Now! button of the PhET Density simulation on your computer.
G. Select ‘Custom’ from the Blocks box.
H. Select ‘My Block’ from the box on top left.

4. Exploring My Block
A. What properties of the block can you change?
___________________________________________________________________________
___________________________________________________________________________
B. What makes a block more likely to sink? How does this change the block’s density?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
C. What makes the block more likely to float? How does this change the block’s density?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________

5. Creating My Block
A. Drag your block onto the side of the pool (on the ground) Create block with a very High density.

B. Explain how you did this.
___________________________________________________________________________
___________________________________________________________________________
C. Do you think the block will sink or float? __________________________________________
D. What is your block’s volume? ___________________________________________________
E. What is your block’s mass? _______________ Now see if it floats. Does it?____________

6. Exploring My Block
A. Your friend has three blocks A, B, and C of the same size, but they each float differently in
water.

B. What do you think is making them float differently? (2)
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
C. Click on “Custom” and then choose “My Block” on the PhET simulation.
D. What did you have to do to make your block behave like A?
___________________________________________________________________________
___________________________________________________________________________
E. What did you have to do to make your block behave like B?
___________________________________________________________________________
___________________________________________________________________________
F. What did you have to do to make your block behave like C?
___________________________________________________________________________
___________________________________________________________________________
G. Could A, B and C be made out of the same material? Why or why not?
___________________________________________________________________________
___________________________________________________________________________
H. Which block must have the most mass? __________________________________________
I. Which block has the second most mass? _________________________________________
J. Which block has the least amount of mass? _______________________________________
7. Exploring objects of “Same Volume”
A. Select “Same Volume” on the PhET simulation.

B. What is the common similarity amongst all these blocks?
___________________________________________________________________________
C. What is different about these blocks besides being different colors?
___________________________________________________________________________
D. Write the procedure you will use to find the volume of these blocks?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
E. C. Record your observations in the data table below.
RULE: _____________________________________________________________________-
___________________________________________________________________________
Data Table:
Block                 Prediction: Sink/Float          Observation: Sink/Float

F. If time permits: Guess which ones of the mystery blocks will float.

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