NTNUJAVA Virtual Physics Laboratory
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"The mind is its own place, and in itself, can make heaven of Hell, and a hell of Heaven." ..."John Milton(1608-1674, English Poet)"
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Author Topic: Spring connect two objects in graviy field  (Read 6661 times)
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Fu-Kwun Hwang
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on: April 12, 2009, 05:58:29 pm » posted from:Taipei,T\'ai-pei,Taiwan

Two objects with mass m1 and m2, connected with a spring (spring constant k).
You can drag the top one and compress it.
What is the minimum force (Fext) to bring the mass m1 jump up?
You can drag Fext to compress the spring,too!

If L0 is the original length of the spring.
The equilibrium poisition y1=y2+L0-m1*g/k;
F1=m(d2y1/dy12)= -k*(y1-y2-L0)-b*vy1;

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