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# Review2 - Bad logic What equation do I use Good logic What...

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Bad logic - What equation do I use? Good logic - What information do I know? What information am I being asked to find? What key ideas/conceptual tools do I apply? What equations express these ideas?

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ENERGY K U mechanical energy E mec = K + U conservative forces (gravity, spring force) W f kinetic friction ! U int internal forces W other external forces Some tips to remember: Kinetic energy is always positive while potential energy and work can be either positive or negative. Use your intuition and the work-KE theorem to keep track of signs. Momentum is always conserved during collisions between isolated bodies. The total kinetic energy is not always conserved, but the center-of-mass kinetic energy and center-of- mass velocity are always conserved. Viewed in the center-of-mass frame, the collision of any two bodies reduces to a head-on encounter of the objects, each one having equal and opposite momentum to the other.
A few more tips: Symmetry arguments can help constrain the center of mass location of objects with uniform density.

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