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Anyway I started doing some research regarding the uses of plastic bottles and was amazed to find them used in many versatile ways. Currently, millions of Filipinos live without any kind of light source at all, but a band of resourceful MIT students have begun changing that. Too bad the video of the floating bottle island was removed, I really wanted to check that out. Nigeria's first house built from discarded plastic bottles is proving a tourist attraction in the village of Yelwa. The Above Top Secret Web site is a wholly owned social content community of The Above Network, LLC. Determine how much weight can be supported by boat hulls of various volumes and how this relates to the density of water. You know from experience that if you drop a steel bolt in a bucket of water that it will sink like a rock to the bottom. If too much cargo or weight is added to the ship, the density of the ship becomes greater than the density of water, and the ship sinks. In this hydrodynamics science project you will make boat hulls of various shapes and sizes using simple materials (aluminum foil and tape) and determine how much weight can be supported by these hulls and how this relates to the density of water. If a boat is sinking because it has too much cargo, how does its density compare to the density of water?
Use the aluminum foil and tape to construct at least five boat hulls with different sizes and shapes. Some different shapes you could try include making the hulls have two pointed ends (like canoes), like the ones on the left in Figure 1, or be square or rectangular (like a rectangular prism), like the ones on the right in Figure 1. Make sure the hulls are not too large to fit in the sink, tub, bucket, or dishpan you will be using.
Some different boat hull shapes you could make include boat hulls that have two pointed ends, like the ones on the left in this image, or boat hulls that are square or rectangular, like the ones on the right in this image. If the hull is a rectangular prism, use the ruler to measure the length, width, and height of the hull in centimeters (cm). If parts of the hull are rectangular prisms but other parts are curved or angled, measure the (imagined) parts of the hull piece-wise (in centimeters), calculate the volume of each part, and add up the volumes to get the total volume for each hull. Being careful not to damage the hull, move the dry rice into the measuring cup (or graduated cylinder). If this is all of the rice that was in the boat hull, then this is the volume of your boat hull. If there is still rice left in the hull, empty the rice from the measuring cup and fill it with rice from the hull until the hull is empty. The water level should be deeper than the height of the boat hulls so that they are able to sink. You can make a graph by hand or use a website like Create a Graph to make a graph on the computer and print it. What do your results tell you about the relationship between buoyancy (amount of weight a boat can support) and volume of the boat hull? The density of the hulls right before sinking should roughly be the same as the density of water.
You roughly calculated the density of water in this science project, but your calculation could be made even more accurate. Tip: To calculate the average weight of a small item, you can use a scale to find out how much 10 or 20 of the items weigh (together) and calculate the average weight by dividing the total weight by the number of items you weighed.
In this science project you investigated the density of water, but what about the density of other liquids? It would be difficult to bring a bathtub to the science fair in order to demonstrate your project, but there is a nice demonstration of buoyancy that you can show in a clear plastic soda bottle— see the DragonflyTV link in the Bibliography in the Background tab. Compared to a typical science class, please tell us how much you learned doing this project. The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. Water covers more than 70 percent of Earth's surface, and marine architects design vessels that allow humans and their cargo to cross through or under those waters safely and efficiently. You may print and distribute up to 200 copies of this document annually, at no charge, for personal and classroom educational use. Reproduction of material from this website without written permission is strictly prohibited.


With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts. Now that you have the basic shape we need to add supports.Measure out the middle of the square and place a 2x4" support there. I'm wondering if there would be a way to rig up something so that the floating dock is primarily kept at the end of another pier in a semi permanent position - maybe even connected to some non moveable posts but then when we wanted to move it out to deeper water on weekends we could easily move it. I put a few poles on the far end through some mounts that I sunk down when it was to stay in place.
The ramp was wobbly for sure, I would think just turning the barrels 90 degrees from how I set them would help a ton. Have you tried putting a small railing & trolling motor on one for a motorized family fishing boat?
Thank You and your instructions, I was finally able to put in a dock, My 14 year old son and I were able to comprehend your instructions and my 11 year old daughter loves it.
Like PKM said there are so many different variables in price here but I spent just over $200.
The bottles, packed with sand, are placed on their side, one on top of the other and bound together with mud. The opinions of our members are not those of site ownership who maintains strict editorial agnosticism and simply provides a collaborative venue for free expression. It is the density (mass per unit volume) of the object compared to the density of the liquid. On an empty ship the hull encloses a volume of air so that the total density is defined by Equation 1 below. If the object is floating, the amount of water that gets displaced weighs at least as much as the object. It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results! To prevent the hull from tipping, carefully balance the load as you add pennies (left to right, front and back— or port to starboard, fore and aft, if you are feeling nautical). To do this put the weight supported by the boat (in grams) on the y-axis and the boat hull volume (in cm³) on the x-axis. To do this put the density before sinking (in grams per cm³) on the y-axis and make a bar for each of the boats (on the x-axis). For example, waxed half-gallon cartons (for milk or juice) can be cut open and unfolded to produce sheets of waterproof material. NASA's Cassini spacecraft sent the European Space Agency's Huygens probe to the surface of Saturn's moon, Titan, where it found evidence that the surface contains large bodies of liquid methane (Phillips, 2005). If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Some of their watercraft designs are enormous, like merchant ships, which carry huge loads of oil, cars, food, clothing, toys, and other goods, across thousands of miles of open waters.
Get as close as you can as your final product will be quite heavy and you don't want to have to move it too far.Luckily I had a relatively flat area near the lake I was placing mine and I could keep things pretty level.
I found it super sturdy, a 2x10 frame would give it a few more inches above the water which could be nice but the build as-is I found extremely stable.
We are now going to attempt your ramp, Turned out perfect with no issues had it built in 2 days ,first day got stormed out.
A good current and a bump with a log or boulder will send you and your barrels in separate directions. To make folds to create the desired hull shape, first score the material with a blunt stylus-the classic Bic pens with the blue plastic caps have a great shape for this. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot. Materials scientists and engineers develop materials, like metals, ceramics, polymers, and composites, that other engineers need for their designs. I went though a few different poles though trying to find a good strong one that wouldn't bend with a good wind.
We put hooks in the raft to attach to the end of the dock so we could easily disconnect it to bring it out deeper for jumping off when we were at camp.
I was thinking of cutting the platform in half and adding heavy duty hinges at all the circles indicated and then splice plates on the 2x8's with lag bolts.
Tied them in with three continuous lengths of braided poly-rope, running through eye screws and over the middle of the barrels.


See below for a detailed description of construction under each picture.Find your deck flotation. If your boat could float 100 pennies in water, how many pennies would it support (on Earth) in a container filled with liquid methane? MANY THANKS TO SCIENCE BUDDIES FROM THE BOTTOM OF MY HEART!!!!REALLY!YOU GUYS ARE JUST PURE AHHHHMAAAZIINNNNNGGG!!!! Materials scientists and engineers think atomically (meaning they understand things at the nanoscale level), but they design microscopically (at the level of a microscope), and their materials are used macroscopically (at the level the eye can see). Make sure and keep two sides of the square on the inside of the square effectively making an 8'x8'4" square. Regardless everything sits nice and high with no water in the barrels, not sure how high a 18 foot jet boat sits but I'm sure you could climb in.
We plan on disconnecting the barrels before taking to the river so it would be lighter and easier to transport but not sure if it would be strong enough. An actual experiment you could do would be to re-do the experiment with a liquid that has a density different than that of water. From heat shields in space, prosthetic limbs, semiconductors, and sunscreens to snowboards, race cars, hard drives, and baking dishes, materials scientists and engineers make the materials that make life better. I figure with all the kids I have with me I needed to make it wide enough for all the kids to get in and out safely. For slightly more you can purchase an inflatable raft that's easy to transport and gives more to prevent punctures. I didn't screw these in yet incase I needed to make adjustments.At this point you can also ready your barrels. We also added solar water proof lights to it so it was more visible in the water at night !
You will need to run a few beads of silicon caulk to the barrel plugs to make sure to keep the water from filling them.Build your deck frame. Though the difference in density is not nearly as dramatic as for liquid methane, it is a lot easier to obtain and safer to work with!
Make sure the plugs are tightened and then apply a layer of silicone caulking over the plug to ensure a good seal and prevent leaking. How does the buoyancy of each boat hull in vegetable oil (measured by the number of pennies it can support) compare to its buoyancy in water?
I did not fill the barrels with any sort of ballast but some people suggest doing so for stability.
I joined my dock and walkway with 4 eyebolts, 2 on dock centered and 2 on walkway that went just on the outside of the ones from the dock. If you put a nut on the eyebolt and mount it through the dock and walkway you can slide the pipe through and tighten the caps down easily.
The wooden frame will help to hold the complete deck together as the barrels will fit snug under the deck.Secure your flotation to the deck. The purpose of the rope is to keep the barrels snug under the dock in rough water.Prepare to install the top deck.
Flip the deck over so the barrels are touching the ground and install the top deck.Install the top surface deck.
You can either make a few DIY concrete anchors or use the eyebolts to attach the deck to land so it does not float away. This deck weighs nearly 250 lbs and it would be wise to make an anchor for each side out of concrete of at least 50lbs each. An organized and "square" raised garden bed can not only give you fresh vegetables, but can beautify your backyard as well.
Thousands of people have applied this to rims, wheels and cars on both new models and used vehicles.
This neat little DIY Ladder is a simple rack that you can lean against the wall and hang your clothes on that would usually be thrown onto the floor.



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