Lecture Notes for PHYS 104 - HOW THINGS WORK: SCI with Einstein at Maryland (UMD)

Notes Information

Material Type:Class Note
University:University of Maryland
  • Experiences
  • Observations
  • No Molecules
  • Negative Charges
  • Positive Charge
  • Cross Section
  • Electrostatic
  • Negative Charge
  • Electricity
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.1 Electronic Air Cleaners Question: A woman rubs her feet on the carpet and gives a shock to her identical twin. If the twin also rubs her feet on the carpet before being touched, the shock will be 1. larger. 2. smaller. 3. the same size. Observations About Air Cleaners . Dust doesn't settle quickly on its own . Mechanical filters gradually plug up . Dust clings to things with static electricity . Air cleaners could be based on static electricity Air Resistance . Different from buoyancy . Opposes the relative motion of air and object . Acts to bring both to one velocity . Consists of a matched pair of forces: - The air pushes on the object - The object pushes on the air - Forces have equal magnitudes, opposite directions . Increases with relative speed and cross section Terminal Velocity . A real falling object experiences two forces: - Weight downward - Air resistance upward (while dropping in still air) . Air resistance affects descent - Object accelerates downward initially...

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