PHYS 101 Study Guide - Midterm Guide: Kinematics, Angular Velocity, Angular Momentum
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Units = joules (j) = kg m^2/s^2 n m. Energy is conserved meaning it can"t be created nor destroyed. Total energy does not change with time: 1. Calculate total energy before a process: 2. Calculate total energy after the process: they must be equal! Work = f * d * cos(theta) Only component of force parallel to direction of motion does work! 90 degree angle cos (90 degress) = zero! Work = f * d: ma * x, m (vf^2 vi^2, m vf^2 m vi^2. Kinetic energy: energy of motion: k = mv^2. Work-kinetic energy theorem: work = k mv^2 (for point particles, no rotation!, change in work = chance in kinetic energy. : w = k: uk mg d = mv (vf^2 vi^2, ukgd = (0 vi^2) U = mgh (mgy vertical position) Change in potential energy: u = - (uf ui) Work done by gravity independent of path: wg = -mg (yf yi)