Physics 106P: Lecture 1 Notes

1
Physics 123
Please pick up an I-Clicker at the front of the
room

• Then vote on this
• Who do you hope wins the Superbowl on Sunday?
• Steelers
• Seahawks
• I dont care I watch for the commercials
• I dont care Im not watching
• Football is stupid

2

• Your Question How long would it take to walk
  around the whole earth?
• 0.5 years 
• 5 years
• 50 years
• 500 years
• 5000 years  

3

• Your Question Does gas have a weight? Now I
  want to know!
• Definitely Yes 
• Probably Yes
• Probably No
• Definitely No  

Hemispheres
4
Weigh Air
5
(No Transcript)
6

• Your Question Oobleck - liquid, solid,
  both or neither?
• Liquid 
• Solid
• Both
• Neither  

7

• Your Question Are there liquids that are
  denser than solids?
• Definitely Yes 
• Probably Yes
• Probably No
• Definitely No  

8

• Your Question Are there gases that are
  denser than liquids?
• Definitely Yes 
• Probably Yes
• Probably No
• Definitely No  

9

• Your Question I understand that solids have
  molecules that are packed tightly, but is it
  solid dependent? For example, is a wall packed
  more closely together than cork board?
• Definitely Yes 
• Probably Yes
• Probably No
• Definitely No  

10

• Can you think of some other situations where we
  learn about things we cant see?
• -black hole, you can't see in that...
• -The study of outerspace. Different galaxies and
  black holes are not necessarily visible to the
  naked eye.
• -The wind. You can't see the wind, but you can
  see the affects of the wind. (i.e. branches
  moving, fallen trees, blowing trash).
• -We learn about molecules as well when a drop of
  water on a paper towel spreads throughout the
  towel.
• -We learn about forces like gravity and
  electromagnatism. We can study very small things
  indirectly like electrons and photons.
• -We cannot see sound when we are listening to
  music. We hear the music and can find out where
  it comes from but we don't see the sound waves
  travelling through the air.
• -We learn about the earth and the layers inside
  the earth. We can't see the core or the mantel
  but we still try to learn about it.
• -We can't see gravity but we know that
  something's holding us down and making us weight
  more than we ought to weigh. )
• -We can't see microwaves. Yet, my food is always
  hot, so I trust that they're there.
• -We learn about large amounts of money, and we
  can't see it. We also use numbers such as
  infinity and Pi that we can't really visually
  see.
• -One situation would be jsut reading books. It
  is a completely different subject matter but when
  you read about fiction you have to develop
  pictures and ideas in your head.

11
Atomic Force Microscopy (AFM)
12
20nm
crystal of satellite tobacco mosaic virus
particles
13
Scanning Tunneling Microscopy (STM)
20nm
Copper surface (you can see atoms)
14
Nickel surface (you can see atoms)
15
Moving Atoms Around (Iron atoms on Copper)
16
Xenon atoms on Nickel surface
17
Iron atoms on Copper
CO molecules on Platinum
Science or Art ?
18
Iron atoms on Copper