Announcements • CAPA Set #5 due today (Friday) at 10 pm • CAPA Set #6 now available, due next Friday • Next week in Section Lab 2: Acceleration due to gravity Make sure to do the pre-lab and print materials before lab • Complete reading all of Chapter 4 • Over the weekend, read Chapter 5 Sections 5.1-5.5
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Announcements CAPA Set #5 due today (Friday) at 10 pm CAPA Set #6 now available, due next Friday Next week in Section Lab 2: Acceleration due to gravity.
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Announcements
• CAPA Set #5 due today (Friday) at 10 pm
• CAPA Set #6 now available, due next Friday
• Next week in Section Lab 2: Acceleration due to gravity Make sure to do the pre-lab and print materials before lab • Complete reading all of Chapter 4
• Over the weekend, read Chapter 5 Sections 5.1-5.5
m
Rock Climber hanging by ropeObject of mass m suspended by a cord.
Stationary: v = 0 and a = 0.
+y
0 = ma = Fnet
T
Fg=mg
Tension in the cord is equal to the weight
of the object.
0 = T - mgT = mg
m
Person of mass m suspended by a rope.+y
T mg Fg
Now, imagine the person is being raised at a constant velocity v > 0.
What’s the relation between T and mg?
v If v=0:
A) T = mgB) T > mgC) T < mgD) Indeterminate from information given.
v = constant, a = 0 again, as in the stationary case.
T
mg = Fg
0 ma T Fg T mg
T mg
Clicker Question Room Frequency BA
m
Object of mass m suspended by a cord.
v = constant +y
T mg Fg
Now, imagine the object is being raised with an acceleration a > 0.
What’s the relation between T and mg?
aBefore:
A) T = mgB) T > mgC) T < mgD) Indeterminate from information given.
T
-mg = Fg
0 ma T Fg T mg
T m(a g) mg
Clicker Question Room Frequency BA
http://en.wikipedia.org/wiki/Atwood_machine
The Atwood machine was invented in 1784 by Rev.
George Atwood as a laboratory experiment to verify the
mechanical laws of motion with constant acceleration.