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Free Fall and Apparent Weight ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Physics 101:  Lecture 05 Exam I
Review from Lecture 4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Free Fall ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],y x
Free Fall ,[object Object],[object Object],[object Object],[object Object],Note : Free fall only works when air resistance is negligible! y x
ACT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],a = -g. Velocity becomes more and more negative. If v > 0, speed decreases. If v <= 0 speed increases.
Free Fall ACTS  ,[object Object],On the way up?   On the way down ? A)  v < 0  B) v = 0 C) v > 0 A)  a < 0  B) a = 0  C) a > 0 A)  v < 0  B) v = 0 C) v > 0 A)  a < 0  B) a = 0  C) a > 0
ACT  ,[object Object],1)  v < 30 mph    2) v = 30 mph    3) v > 30 mph ,[object Object],[object Object]
Free Fall Example  ,[object Object],v 2 -v o 2  = 2 a   y  y = (v 2 -v o 2  )/ (2 a) = -30 2  / (2 * -9.8) = 46 m. v = v 0  + a t t = (v-v 0 ) / a = (0 – 30 m/s )/ (-9.8 m/s 2 ) = 3.1 seconds
[object Object],[object Object],ACT  y = y o +v o t + ½ a t 2 Dennis: 0 = H + v o t - ½ g t 2 Carmen: 0 = H - v o t - ½ g t 2 v 0 v 0 Dennis Carmen H v A v B
[object Object],[object Object],ACT  v 0 v 0 Dennis Carmen H v A v B Correct :  v 2  = v 0 2  -2g  y
Apparent Weight ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],mg N y x
Apparent Weight Preflight ,[object Object],[object Object], F y  = ma y N – mg = ma y N = m(g+a) a < 0. so N < mg 50%   19%  31% “ Acceleration is downward (causing you to slow down), so in our case, acceleration would be negative and using the equation: F=m(g+a), F=m(g-a); thus you would be lighter.” mg N
Great Explanations! (Wrong Answer)  “ Because as you go up higher gravity decreases. ” “ Unless the elevator was accelerating, which it does not state in the question that it is, the weight would be unchanged because the acceleration is 0.” “ Because accelerating up increases apparent weight.”
Apparent Weight Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],N = m(g+a) a = 0  so  N= mg  = 490 Newtons a = 0  so  N= mg  = 490 Newtons a = +9.8 m/s  so  N= 2 mg  = 980 Newtons a = -9.8 m/s  so  N= 0 mg  = 0 Newtons
Apparent Weight ACTs ,[object Object],[object Object],[object Object],45 N = m(g+a) Weight increases when accelerating up decreases when accelerating down. A  B  C A  B  C y x
Summary of Concepts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Lecture05

  • 1.
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. Great Explanations! (Wrong Answer) “ Because as you go up higher gravity decreases. ” “ Unless the elevator was accelerating, which it does not state in the question that it is, the weight would be unchanged because the acceleration is 0.” “ Because accelerating up increases apparent weight.”
  • 14.
  • 15.
  • 16.

Notes de l'éditeur

  1. Demos penny and feather. First with air resistance, then without.
  2. Demos penny and feather. First with air resistance, then without.
  3. Have students make plot?