Activity 5

Activity 5

Lithium- 3 protons, 3 neutrons and three electrons.  Density- 0.534 g/cm3











Boron- 5 protons neutrons and electrons. Density- 2.37 grams per cubic centimeter


Density is mass over volume, P= M/V.  It is essentially how much water something would displace is it was submerged compared to the mass of the something is.  the higher the density the more compact the unit is.

PhET- Density Activity- Funsheet

Custom Section                                                                                     Name_____________

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Styrofoam	.75KG	5.00L	0.15 KG/L	yes
Wood	2.00	5.00L	.40KG/L	yes
Ice	4.60KG/L	5.00L	0.92KG/L	yes
Brick	10.00KG	5.00L	2.00KG/L	No
Aluminum	13.50KG	5.00L	2.70KG/L	no

 

1. In the custom setting, choose the ‘My Object’ option in the material drop down box.  Set the mass of your object to 4 kg.  Adjust the volume to find the minimum volume needed to make the object float.

 

Volume_________4.00________                Density_________1.00_________

 

1. How does the density of a large piece of aluminum compare to a small piece?

Its is the same density no matter what the volume just changes

 

 

Same Mass Section

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Blue
Yellow
Green
Red

 

Same Volume Section

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Blue	5.00KG	5.00L	1.00KG/L	no
Yellow	5.00KG	10.00L	.50KG/L	yes
Green	5.00KG	2.50L	2.00KG/L	no
Red	5.00KG	1.25L	4.00KG/L	no

3.  Looking at the data on the previous page, what must be true about the density of

     an object in order for it to float?

It must be higher than 1.0KG/L

 

Same Density Section:

4.  Calculate the density of the blue object in this section.

 

     Mass _______3.00KG______         Volume___3.00L____________        Density__1.00KG/L______________

 

5.  Explain why both the yellow and red objects float when they have different sizes.

Since they have the same density it doesn’t matter what the size of the objects are because they both displace the same amount of water ration wise with their mass.

 

 

 

Mystery Section:

6.  Before you start, pick an object that you think will float.  _______D____________________

     Pick an object that you think will sink.  _________B________________

 

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
A	65.14KG	3.38L	19.27KG/L	no
B	0.64KG	0.64L	1.00KG/L	yes
C	4.08KG	4.08L	1.00KG/L	yes
D	3.10KG	3.10L	1.00KG/L	yes
E	3.53KG	1.00L	3.53KG/L	no

 

 

7.  In the Custom section describe the difference between how Styrofoam and ice  

     floated.  Also explain why you think this is the case?

 

Styrofoam bounced to the top right away when you dropped it in whereas the ice sank to the bottom when I dropped it and slowly floated back to the top.

 

8.  In the Same Mass Section discuss what was interesting about the blue object’s behavior in the water.

It was like it didn’t know if it wasn’t to float or not.  It slowly floated back up to the top and barely stayed a float.

 

 

 

9.  In the Mystery Section, click on the “Show Table” button.  What is the most dense   

     object on the list?  Write its density as well.

Material A its density was 19.27KG/L

 

 

10.  List something you learned from this activity.

Size has nothing to do with density.

#4 chart see above




The science standards that could be met through this activity would be not only density but also volume mass and units of measure.  another key one would be about matter.