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I'm having some kind of mental block.

If I extend ##l_x## by ##\delta## ,I expect the hanging mass to move ##\frac{ \delta}{2}##.

I can't figure out how this is the case from the constraint:

$$ l_x+l_1=C $$

##C## is an arbitrary length

I keep getting that ##l_1## changes by ##\delta##, but that must mean the height of the mass changes by ##\delta##...

If I extend ##l_x## by ##\delta## ,I expect the hanging mass to move ##\frac{ \delta}{2}##.

I can't figure out how this is the case from the constraint:

$$ l_x+l_1=C $$

##C## is an arbitrary length

I keep getting that ##l_1## changes by ##\delta##, but that must mean the height of the mass changes by ##\delta##...

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