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Others Like “Hey Gear Heads! The Physics of Bicycle Gear Ratios”

Science Fair Project Idea
thumbnail Are you a budding Marianne Vos or Greg LeMond? Are you into cycling and speed? Then this is the science fair project for you! In this science fair project, you will determine the best gear ratio for your bike, to get the highest speed after a curve and onto a straightaway. You will learn a lot about applied mechanics and gears, all while having fun riding your bike. Read more
ApMech_p043
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Time Required Average (6-10 days)
Prerequisites You must be able to ride a bicycle and have access to a bike path.
Material Availability You must have access to a multi-speed bicycle and bicycling safety gear.
Cost Low ($20 - $50)
Safety Minor injury possible. Wear all necessary bicycling safety gear, especially a helmet. Adult supervision is recommended.
Science Fair Project Idea
Music boxes, bicycles, and clocks all have one thing in common: GEARS! You might say that gears make the world turn, since they are in so many mechanical instruments. How do they work and how do you know which gears to use? Find out in this simple experiment. Read more
ApMech_p016
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Time Required Very Short (≤ 1 day)
Prerequisites None
Material Availability Readily available
Cost Low ($20 - $50)
Safety No issues
Science Fair Project Idea
thumbnail If you ride a bike, you probably know that you have to occasionally pump up the tires to keep them fully inflated. Over a long period of time, the tires slowly leak air, so their pressure will decrease. Have you ever noticed that it is actually harder to ride a bike when the tire pressure is too low? This is because the tires are a big factor in the rolling resistance of the bike. In this sports science project, you will measure how tire pressure affects the force required to move a bike. How… Read more
ApMech_p029
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Time Required Average (6-10 days)
Prerequisites None
Material Availability This science project requires a bike with training wheels and a special spring scale to measure force. See the Materials and Equipment list for details.
Cost Low ($20 - $50)
Safety Only do this science project in a safe area where there are no cars, like a playground or a sidewalk. Do not do this science project in a street or parking lot. The volunteer riding the bike must wear a bike helmet.
Science Fair Project Idea
thumbnail Have you ever tried to ride your bike up a flight of stairs? Vehicles with wheels are great at traveling on paved roads or flat ground, but when it comes to stairs or uneven ground in the woods, wheels are not always such a great option. Inspired by real-life all-terrain robots, in this engineering project you will design and build a LEGO® robot that can travel over bumpy ground, through your yard, or even up a stack of textbooks — and almost anything else you can think of! Read more
Robotics_p009
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Time Required Average (6-10 days)
Prerequisites Experience building with LEGO® and programming for LEGO® Mindstorms® is required for this project.
Material Availability This project requires a LEGO® Mindstorms® NXT kit and compatible programming software. See the Materials and Equipment list for details.
Cost Very High (over $150)
Safety No issues
Science Fair Project Idea
thumbnail "What?! Many of my toys are also machines?" That's right—simple machines! Simple machines are everywhere! Under your feet when you climb stairs, in your hand when you use a utensil to eat your dinner, even in your arm when you throw a ball. Come visit this science fair project and explore the six types of simple machines. Find out how many are hiding under the hinged lid (yes, another simple machine) of your toy box! Read more
ApMech_p042
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Time Required Short (2-5 days)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No issues
Science Fair Project Idea
Skateboarder alert: Extreme performance needed in this project. Dude, you can cruise and carve while you investigate which skateboard wheels produce the fastest (and slowest) rides on your terrain in these experiments. You pick the wheels and design the tests you think will produce the most extreme results for speed and turns. Do this project and you can work on your ride and learn some science about the speed, spin, and design of skateboard wheels. Read more
Sports_p018
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Time Required Very Short (≤ 1 day)
Prerequisites None
Material Availability Specialty items
Cost Average ($50 - $100)
Safety Minor injury possible
Science Fair Project Idea
How does ski wax affect the sliding friction of skis? You can model this with an ice cube sliding down a plank: how high do you need to lift the end of the plank before the ice cube starts to slide? Try this with one side plain wood and the flip side waxed wood (use paraffin wax, candle wax or ski wax). Make sure both sides are equally smooth to start with. Do at least three trials. More advanced: using what you know about the forces acting on the ice cube, derive equations to calculate the… Read more
ApMech_p031
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Time Required Short (2-5 days)
Science Fair Project Idea
You can model this with an ice cube sliding down a plank: how high do you need to lift the end of the plank before the ice cube starts to slide? Try this with one side plain wood and the flip side waxed wood (use paraffin wax, candle wax or ski wax). Make sure both sides are equally smooth to start with. Do at least three trials. More advanced: using what you know about the forces acting on the ice cube, derive equations to calculate the coefficient of friction for each case. Variation:… Read more
Sports_p042
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Time Required Short (2-5 days)
Science Fair Project Idea
Many sports skills require quick reaction times: think of hitting a 95-mph fastball, returning a 100-mph tennis serve, or blocking a slapshot at the net in hockey. (The Experimental Procedure section below has one way to measure reaction time.) Is your right hand faster than your left? Can you improve your reaction time with practice? Do both hands improve if you only practice with one hand? Try relating your reaction time to real situations in your favorite sport. For example, calculate… Read more
HumBio_p005
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Time Required Average (6-10 days)
Material Availability Readily available
Cost Very Low (under $20)
Safety No issues
Science Fair Project Idea
thumbnail It is fun to shake up a snow globe and watch the "snow" slowly fall. You can imagine that if the snow fell down very quickly it would be disappointing. But there are times when scientists in a laboratory want this to happen. Scientists use samples that have liquid mixed with small, solid pieces (like the inside of a snow globe), and they need all of the solid pieces in a clump, separated from the liquid. Instead of waiting for the pieces to slowly fall out of the liquid, scientists speed up… Read more
BioChem_p041
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- Less Details
Time Required Short (2-5 days)
Prerequisites None
Material Availability You will need to purchase the centrifuge tubes online. See the Materials and Equipment section for details.
Cost Average ($40 - $80)
Safety No issues
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