PHYA10H3 Study Guide - Final Guide: Kinetic Energy, Circular Motion

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How to solve almost any mechanics (not waves) question in phya10. P = fav t and you are done. If more than one moving object: conserve momentum. Non-uniform: conserve energy unless it asks about time. (t) = 0 + t + t2. Otherwise: x(t) = x0 + v0 t + a t2 (ax = 0 ?) Yes: 2 = k/m (assuming mass and spring) x = xeq + a cos( t + 0) vx = - a sin ( t + 0) Vertical springs are tricky: mg = k xeq. Yes: try to use energy conservation or work. Didn"t work? v(t) = a(t) dt and x(t) = v(t) dt. Constant a? x(t) = x0 + v0 t + a t2. 1: always choose a reference frame which is not accelerating. 3: fa on b = -fb on a (in other words, every force is an action between two objects)

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