Fast and Easy Science Fair Projects: Flying in Circles
This is my 26th hub on Fast and Fair Science Fair Projects. This one is extremely easy and fun! I'm sure you'll enjoy reading and trying out this one too, especially kids! Have fun!
Air friction: Sometimes good, sometimes not
Purpose: Set up some demonstrations showing how air friction (resistance) affects falling abjects.
Overview: When we see or hear the word "friction: we usually think about it taking place between two surfaces. As project 4 explained, friction is the resistance to motion when two things rub together. Friction can also occur, however, between air and any object that moves through it. Air friction causes resistance, which pushes against the object.
Car manufacturers try to design cars that are "Streamlines," which means the cars are shaped to let air flow smoothly around them because it then takes less energy to move the car. This saves on fuel. The car will get more "miles (or kilometers) per gallon" - go farther on less gasoline at the fuel pump, and the car will also put less pollution into the air.
Designers of aircraft, just like the designers of cars, try to make their crafts have as little resistance to the air as possible, but sometimes, air friction is desirable. When sky divers jump out of an airplane, the parachutes need to have a lot of air resistance to slow their descent and land them safely to the ground.
Hypothesis: Air friction can be increased and decreased simply by changing an object's shape.
- Plastic trash bag
- thread or thin string
- 2 metal washers
- 2 standard size sheets of typing paper
Procedure: First we'll compare how air friction affects two sheets of typinf paper, keeping the material and height Constant and shape the only Variable. Fold one of them into a paper airplane and crumple the other into a ball. Stand in a clear area in a room. Stretch your arms out to your sidesm holding the airplane nose down in one hand and the paper ball at the height of the airplane nose in the other. At exactly the same time, drop them.
Next, with a scissors, cut the section of plastic the size of a sheet of paper out of the plastic bag. Tke a pencil or nail and carefullt poke a small hole near the edge of each corner. Cut four pieces of thread or thin string, each 2 feet in length. Tie one end of each pieve to each hole in the plastic. Tie the loose ends of four threads to a metal washer. The washer is our sky diver, and the plastic bag is his parachute.
Now, cut another piece of plastic the same size, put a washer inside and wrap and tie it into a bundle using 8 feet of the same thread or string. Holding the parachute and wrapped plastic out so they are the same height from the floor, let them go. Here afain, shape is the onl Variable.
In order to really demonstrate the difference streamlining makes, do one more drop. In one hand, hold your sky diver. In the other hand, hold the paper airplane, wit h its nose facing the ground. Out-stretch and raise your arms so the bottom of the sky diver is the same distance from the ground as the nose of the airplane. Let go of both objects at the same time. Does the sky dover's parachute encounter much more resistance, from friction with the air, than the streamlined paper airplane?
Results and Conclusion: Write down the results of your experiments. Come to a conclusion as to whether or not your hypothesis was correct.
Something more: Would it make a difference if the shape of the parachute was square or round instead of rectangular? Would another shape have even more air resistance?
Thanks for reading this one! Hope you liked it! If you want more on Fast and Easy Science Fair Projects, you can try my other Hubs relating to the topic. Here are five of my Top Hubs on Fast and Easy Science Fair Projects for you:
- Fast and Easy Science Fair Projects: Floating Along
This is my 25th hub on Fast and Fair Science Fair Projects. This one is extremely easy and fun! I'm sure you'll enjoy reading and trying out this one too, especially kids! Have fun! Buoyancy: The...
- Fast and Easy Science Fair Projects: We are #2
Second- and third-class levers Purpose: Learn to use a second class lever (a simple machine) to reduce the force required to lift a heavy object. Overview: A lever is mage up of a long shaft or board...
- Fast and Easy Science Fair Projects: The Mighty Mo
Momentum: A product of force times mass Purpose: Can momentum be increased by increasing the mass of the moving object or by increasing its speed? Overview: Momentum is the force with which an object is...
- Fast and Easy Science Fair Projects: Hot rocks
Heat transfer from one medium to another Purpose: Is there a good way to store solar heat, and release it slowly over time? Overview: Did you ever touch a rock that has been baking in the sun on a...
- Fast and Easy Science Fair Projects: Blown Away
This is my 23rd hub on Fast and Fair Science Fair Projects. I'm sure you'll enjoy reading and trying out this one too! Good luck! Fluidics: air flow around shapes Purpose: Determining how air flows around...
More by this Author
This is my 34th hub on Fast and Easy Science Fair Projects. This one is extremely easy, highly useful and fun! I'm sure you'll enjoy reading and trying out this one too, especially kids! Cheers! =) ...
The effect of water on Magnetism Purpose: Does water affect a magnetic field? Overview: Sound waves go through both water and air. In fact, they travel farther and faster in water than they do in air. How about...
Here are some great ideas for your Facebook status updates. All of these status updates are free for you to use and you just have to copy and paste the one you want to your Facebook profile. If...