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Kepler's 2^nd Law
BlackBoard Notes

• Hooke's version of planetary motion:

F_r = –kr, i.e. spring law

If no external torques, = constant, and A₁₂ = A₃₄ = A₅₆

Equal areas in equal times

A₁₂ = A_triangle + A_{small slice} ≈ A_triangle = ½bh

• Measure b and h to the nearest 0.1 cm.

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©	St. Lawrence University	Department of Physics

Revised: 30 Nov 2009

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