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Every Day Physics

Every Day Physics. Question:. How much of an effect does varying tire pressure have on the performance of a bicycle rolling down a hill? . Hypothesis: . Increasing the tire pressure will provide a significant improvement in the performance of a bike. .

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Every Day Physics

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  1. Every Day Physics

  2. Question: How much of an effect does varying tire pressure have on the performance of a bicycle rolling down a hill?

  3. Hypothesis: • Increasing the tire pressure will provide a significant improvement in the performance of a bike.

  4. A Quick Overview of Road Bikes and Tires

  5. Forces Acting Upon a Bike Travelling Down a Hill FDrag FNorm FFriction FGrav

  6. Road Bike Tires • Tires tested : Clincher tires • Most popular tire • Air pressure pushes out on tire to hold it in place Rubber: Outermost part of tire. Protects the fabric from punctures Beads: Metal which sits in wheel grooves and hold the tire in place Fabric: Woven between beads and gives the tire it’s shape

  7. Materials • 2012 Cannondale Caad10 5 size 52 • Aluminum frame • Carbon fork • Tires: SchwalbeLugano, 700x23c • Recommended PSI: 85-130 • Wheels: Shimano RS10

  8. Materials cont. • Masking tape • Trundle wheel • Joe Blow Sprint floor tire pump • Strava cycling app for android

  9. 1. Start at a set point on top of the hill

  10. 2. Lifted legs and coasted down hill

  11. (attempt to maintain a standard position on the bike)

  12. 3. Coast to stop, and mark where the front wheel landed

  13. The Overall Spread of Distances

  14. Data Tire Pressure Distance Traveled

  15. Front Tire 40 PSI 60 PSI 80 PSI 100 PSI

  16. Rear Tire 40 PSI 60 PSI 80 PSI 100 PSI

  17. PSI vs. Distance Traveled Distance Traveled (meters) PSI of Tire

  18. A Similar Experiment: Rolling resistance at varied air pressures 60 PSI 80 PSI 100 PSI

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