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Torque and equilibrium
Homework: handout 8, 10, 13
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View Full Document Predict the readings on the scales:
?
10
30
20
0
?
10
30
20
0
0.5m
1.0 m
1.0
kg
M
bar
= 1.0 kg
Predict the readings on the scales:
10
30
20
0
10
30
20
0
0.5m
1.0 m
1.0
kg
10 N
10 N
M
bar
= 1.0 kg
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View Full Document Predict the readings
on the scales.
?
?
0.8 m
A. T
L
=4N; T
R
=16N
B. T
L
=5N; T
R
=15N
C. T
L
=6N; T
R
=14N
D. T
L
=7N; T
R
=13N
E. T
L
=8N; T
R
=12N
Now predict the readings:
?
10
30
20
0
?
10
30
20
0
0.8m
1.0 m
1.0
kg
M
bar
= 1.0 kg
a
= 0 does not give us enough info.
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View Full Document Which force is more effective in
causing rotation?
standard frictionless pond
standard meter stick
F
1
F
2
standard pivot point
Which force is more effective in
causing rotation?
standard frictionless pond
standard meter stick
F
1
F
2
standard pivot point
B
A
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View Full Document Now which force is more effective in
causing rotation?
standard frictionless pond
standard meter stick
F
1
F
2
standard pivot point
Now which force is more effective in
causing rotation?
standard frictionless pond
standard meter stick
F
1
F
2
standard pivot point
B
A
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View Full Document Definition of torque (
τ
):
Fixed Pivot
Point
F
r
θ
()
sin
rF
τ
θ
=
α
∝
rotational analog of 2
nd
law
There are two useful methods
of finding torque
•
Force method
•
Lever arm method
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This note was uploaded on 04/13/2008 for the course PHYS 211 taught by Professor Shannon during the Spring '08 term at MSU Bozeman.
 Spring '08
 Shannon
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