I believe that a scientist looking at nonscientific problems is just as dumb as the next guy. -Richard Feynman Nobel Prize in Physics, 1965 - PowerPoint PPT Presentation

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I believe that a scientist looking at nonscientific problems is just as dumb as the next guy. -Richard Feynman Nobel Prize in Physics, 1965

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Title: I believe that a scientist looking at nonscientific problems is just as dumb as the next guy. -Richard Feynman Nobel Prize in Physics, 1965


1
I believe that a scientist looking at
nonscientific problems is just as dumb as the
next guy. -Richard Feynman Nobel Prize in
Physics, 1965
2
Skill Goal for Chapter 4
  • Draw a correct free body diagram (FBD) for every
    object in a described scenario
  • 0. FBDs are only done in inertial
    (non-accelerating) frames of reference
  • Use to figure out if any
    forces are missing, and what forces (or
    components) have to balance
  • Include on forces ON a body, not forces exerted
    BY a body
  • Use 3rd law (equal and opposite reaction force
    to help get forces on different bodies
  • Note Acceleration is not a force.

3
For which scenario is FN larger? Choose A, B or
C FN is the same for both.
  • For which scenario is Ff larger?
  • Choose A, B, or
  • C Ff is the same for both.

4
2. Include only forces ON the body of interest
  • When I push on a wall and stand at a steep angle,
    what force shown should not be included in a FBD
    of me?
  • My weight, mg
  • The normal force from the floor
  • My push on the wall
  • Friction with the floor
  • What can you conclude about the push of the wall
    on me (Fw) and the force of friction from the
    floor (Ff)?
  • Ff gt Fw D. Either A or B
  • Ff Fw E. Either B or C
  • Ff lt Fw

5
3rd Law Equal and Opposite
  • As I stand still, not accelerating, what is the
    equal and opposite reaction force to the force
    of gravity on me (that is, my weight)?
  • The floor pushing up on me
  • My gravitational pull on the Earth
  • Neither of these.
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