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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"

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 Author Topic: Spring connect two objects in graviy field  (Read 7120 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Fu-Kwun Hwang
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Posts: 3085

 « Embed this message 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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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"