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τorque
I. τorque
A. The rotational equivalent of force is _____________. Its symbol is _______.
B. Torque = lever arm (r) x perpendicular force (F).
C. When θ = 90o,
When θ = 0o,
Torque is a maximum when θ = ___________.
II. Rotational Equilibrium
A. In rotational equilibrium, [pic]
In other words, the clockwise torques = the counterclockwise torques
B. Examples of rotational equilibrium:
1.
2.
3.
4. Find the force needed to hold the 5.0-meter beam that weighs 500 N level.
5. Find the force needed to hold the same beam level with the addition of a hanging weight.
-----------------------
F
r
2.0 m
100 N
2.0 m
?
2.0 m
100 N
4.0 m
?[?]
$(4œÂÌÎÐÒØÚèêìîïßÏÀß°£°À”ÀˆyÀjTjÀjy;”0jhÊ:“h.tóCJOJQJU[pic]aJmHnHu[pic]*jhœF¿CJOJQJU[pic]aJmHnHu[pic]hÊ:“hD
CJOJQJaJhÊ:“h@?CJOJQJaJh`;CJOJQJaJhÊ:“hhÊ:“hhÊ:“hÊcMCJOJQJaJhÊ:“h;L·5?CJOJQJaJhÊ:“hÊcM5
?
4.0 m
600 N
800 N
F
100 N
2.0 m
F
................
................
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