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Unformatted text preview: o the wall. In case 2 the plank is
half the length but has the same mass as in case 1, and the
wire makes the same angle with the plank.
In which case is the tension in the wire biggest?
In
A) Case 1 B) Case 2
C) Both are the same gravity
M
L
42% got this right M
L/2 Physics 211 Lecture 17, Slide 24 Act
Which equation correctly expresses the fact that the total
torque about the hinge is zero?
torque L
=0
2 L
B) TL − Mg = 0
2
C) TL − MgL sin(θ ) = 0
C) The L cancels out:
The T Ls
in (θ
) A) TL sin(θ ) − Mg
A) θ
Mg
L Mg
T sin(θ ) =
2
Physics 211 Lecture 17, Slide 25 In which case is the tension in the wire biggest?
In
A) Case 1
B) Case 2
C) Same M M L L/2 A) the force is at a point that is twice the length away so the torque is twice
as big
B) they both have a net force and torque of zero case two has a shorter
lever arm so it needs a bigger force to produce the same torque to cancel
out their equal weights.
C) The tension will be the same in both cases because T=Mg/2sin(theta),
C)
and theta and M are equal in both cases.
Physics 211 Lecture 17, Slide 26...
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This note was uploaded on 03/18/2013 for the course CSCI 402 taught by Professor Tuceryan during the Fall '10 term at IUPUI.
 Fall '10
 Tuceryan

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