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PHY
Blo

How Things Work : The Physics of Everyday Life

Bloomfield, Louis A., 2013
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Medienart Buch
ISBN 978-1-118-23776-2
Verfasser Bloomfield, Louis A. Wikipedia
Systematik PHY - Physik
Systematik ENC - CLIL - Content & Language Integrated Learning
Schlagworte Lehrbuch, Thermodynamik, Flugzeug, Physik, Elektrodynamik, Licht, Optik, Magnetismus, Kernenergie, Raumfahrt, CLIL, Fachsprache, Bewegungsgesetz, Flüssigkeit, Ballon, Resonanz, Elektrizität, Elektromagnetismus
Verlag Wiley
Ort Hoboken
Jahr 2013
Umfang XIX, 571 S.
Altersbeschränkung keine
Auflage 5th Ed.
Sprache englisch
Verfasserangabe Louis A. Bloomfield
Illustrationsang Ill., Abb., graph. Darst.
Annotation As she rounds the corner in a race, a cyclist is using physics to stay on her bicycle and maintain her lead. Like many objects of everyday life, the bicycle is a wonderful context in which to explore science and discover the physics concepts that make things work. This book is built on that case study approach - finding introductory physics in the "how" and "why" questions about ordinary objects.

At rest, the uprigt bicycle and rider are in unstable equilibrium; if the combined center of gravity isn't exactly above the line connecting the contact points with the ground, the rider and bicycle will tip over. Because the bicycle is moving forward, however, both are remarkably stable. Whenever the rider begins to tip, the bicycle's front wheel naturally pivots and steers the bicycle back under the center of gravity.

As she turns, the cyclist is deliberately leaning toward the inside of her curving path. She is using the bicycle's instability to compensate for inertia, the tendency of objects to coast in straight lines at steady paces. While inertia alone would tip her toward the outside of her turn, the bicycle's instability would move her in the direction she is leaning, which is toward the inside of her turn. By leaning and turning simultaneously, she is making those two competing effects balance one another and she turns safely.

Staying on the bicycle is great, but our cyclist is intent on winning the reace! Apart from her opponents, her biggest obstacle is pressure drag. As she rushes through the motionless air, she drags some of that air with her and transfers her energy and forward momentum to it. Although crouching over the handlebars reduces the size of the wake she leaves behind her, she must still replace the energy and momentum lost to the air. Her powerful pedaling causes the pavement to push her bicycle forward and compensate for the backward push from the air. At the same time, she is converting chemical potential energy in her body into kinetic energy in her motion and thereby staying at the head of the pack.

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