# 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 – PowerPoint PPT presentation

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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.