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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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