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Central Force Problem

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Unbounded Motion<br />

• Take V’ similar to 1/r 2 case<br />

• Only general features are relevant<br />

• E = E 1 r > r min<br />

E<br />

= V′<br />

( r )<br />

1 min<br />

• Particle can go infinitely far<br />

E 1<br />

V′<br />

() r<br />

1<br />

2 mr<br />

2<br />

Arrive from r = ∞<br />

E 2<br />

r<br />

Turning point<br />

E = V ′ r = 0<br />

Go toward r = ∞<br />

E 3<br />

A 1/r 2 force would<br />

make a hyperbola

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