Tape both pieces of the straw to one side of the water bottle.Scissors or sharp knife (Have an adult use or supervise your use of this tool.).You will see, however, getting your wheel and axle to spin smoothly is a critical part of getting your balloon car to work!
This invention has been around so long, we take it for granted-and many of us ride in wheeled vehicles every day. The car also contains a simple machine: the wheel and axle. In this project you will use this principle to build a toy car that is propelled forward by the stream of air escaping a balloon as it deflates. This principle is used in real rockets and jets that shoot a high-speed stream of gases out the back of their engines, propelling the vehicle forward. This means that there must be an equal and opposite reaction-the air pushes back on the rubber, propelling the balloon forward. When you inflate a balloon and then release the nozzle, the rubber contracts and pushes the air out the nozzle. Energy never “disappears”-it just changes to another form.Īnother way to think about the balloon's movement is to use Newton's third law of motion: For every action there is an equal and opposite reaction. According to the law of conservation of energy, the total amount of energy is conserved.
Some of the energy is also converted to heat due to friction. When you release the balloon, this energy is converted to kinetic energy-the energy of motion-as the balloon zooms around the room. It might not seem like it at first, but a simple balloon car is loaded with physics and engineering concepts! When you inflate a balloon, it stores potential energy in the form of stretched rubber and the compressed air inside. You can even find a friend, build two cars and race them against each other.
Turn a pile of trash into a toy car-and watch it go! In this activity you will learn some physics concepts and use recycled materials to build a toy car that is propelled by a balloon.
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