PhET- Density Activity- Funsheet Custom Section Material Styrofoam Name_____________ Mass (kg) 0.75 Volume (L) 5.00 Density (kg/L) 0.15 Does it Float? Yes 2.00 5.00 0.4 Yes 4.60 5.00 .92 Yes 10.00 5.00 2.00 No 13.50 5.00 2.70 No Wood Ice Brick Aluminum 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____7.01_____________ Density___0.57_______________ 2. How does the density of a large piece of aluminum compare to a small piece? It’s exactly the same Same Mass Section Material Blue Mass (kg) 5 Volume (L) 5 Density (kg/L) 1 Does it Float? No 5 5 1 Yes 5 2.50 2 No 5 1.25 4 No Mass (kg) 6 Volume (L) 5 Density (kg/L) 1.2 Does it Float? No 8 5 1.6 No 4 4 1 Yes 2 2 1 Yes Yellow Green Red Same Volume Section Material Blue Yellow Green Red 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 has to have a density of 1 Same Density Section: 4. Calculate the density of the blue object in this section. Mass ________3 kg_____ Volume____3 L___________ Density______1__________ 5. Explain why both the yellow and red objects float when they have different sizes. They both have a density of 1 Mystery Section: 6. Before you start, pick an object that you think will float. ___D________________________ Pick an object that you think will sink. ____E_____________________ Material A B Mass (kg) 65.14 Volume (L) 3.38 Density (kg/L) 19.27 Does it Float? No .64 .64 1 Yes 4.08 10.20 0.4 Yes 3.10 3.10 1 Yes 3.53 1 3.53 No C D E 7. In the Custom section describe the difference between how Styrofoam and ice floated. Also explain why you think this is the case? Styrofoam almost bounced as it was floating to the top of the water and floated very quickly. Ice floated much more slower than Styrofoam. I believe the difference in density is why this is happening. 8. In the Same Mass Section discuss what was interesting about the blue object’s behavior in the water. It sunk to the bottom at a gradual slow pace 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. Gold is the most dense object. It has a density of 19.3 10. List something you learned from this activity. I learned that the bigger the volume, the lower the density.