Go to File and Save As . Save This Document in Your Folder and Call It Buoyancy

Buoyancy Internet Activity

INSTRUCTIONS  Go to “File” and “Save As”. Save this document in your folder and call it “Buoyancy”.  Insert your name, date, and class as a header.  Fill in the blanks in each question. Use Arial, Size 12 font, and make sure that your answers are in bold and italics. Erase the line in each question and insert your answer.  Save.

Follow the links on the “Buoyancy Website” and answer the following questions. http://www.blackgold.ab.ca/Schools1/Schools/Beaumont/lapointe/buoyancy_webpage /

Go to “Internet Adventure”.

START HERE

1. When you place a block of wood in a pail of water, the block ______some of the water, and the water level ______. If you could weigh the water that the wood displaces, you would find that its weight ______the weight of the wood.

2. A block of wood made of oak, for example, sits ______in the water (and therefore displaces more of the water) than does a block of pine.

3. The reason is that it's heavier for its size, or ______-- in this case, the molecules that make it up are ______than the molecules that make up the pine.

THEN GO TO

4. For the sub to sink, it needs to weigh ______than the maximum weight it can displace. By adding one pound of sand plus a little more, the sub's overall weight is just over two pounds.

NEXT VISIT

5. The space within the boat fills up with water, either through the hull or over the boat's sides, causing the boat to lose its ______.

6. …an object ______when it weighs more than the water it ______.

NOW SWING BY

7. When the driver hits the gas, you're ______into your seat. The balloon, on the other hand, moves ______! 8. When the driver hits the brakes, your body lurches ______. And what happens to the balloon? It flies toward the ______of the car!

9. A helium-filled balloon floats because the surrounding air (which is really a fluid) is being pulled down with a ______. It's as though the air is pushing itself down, trying to get to the ground, and the lighter balloon is in its way. The balloon is, in effect, being pushed ______by the heavier air.

10. In the car, you're not the only thing that gets pushed back while accelerating. A toy on the seat feels the force, as does the seat itself, as does the fuzzy dice hanging from the rearview mirror. Even the air feels the ______-- and moves toward the back of the car because of it. Sure, the balloon also feels the force and, like the air, has the freedom to move ______, but the denser air pushes its way past. And with the heavier air crowding the back of the car, there's no place for the balloon to go but ______.

DON’T FORGET

No question here…just make sure to read about hot air balloons and play the flash activity in the “what’s in the balloon” link.

YOU’RE ALMOST DONE

11. See how rough the surface is? The insides are just as rough and filled with many ______. These air bubbles work like balloons, trapping ______inside the rock so it floats on water.

FINALLY

No questions here. Just play the game and record your score here: ______

Would a PFD (Personal Flotation Device) with 22 pounds of buoyancy be able to help Mr. Slade float if he weighs 210 pounds? Why or why not? (Go here http://www.boatsafe.com/kids/buoyancy.htm for help with your answer.)