Physics 51 "Study Guide" for Midterm #1 ("Laundry List" of important concepts) Todd Sauke Concept (important concepts in bold; vectors also shown in bold ) Symbol or Equation Prerequisites: Physics quantities are typ. either scalars or vectors (magnitude & direction) components of vectors add From mechanics , total external force on a body = mass x acceleration Σ F ext = m a (SI newton, "N") Mass (SI kilogram, "kg") resists change in motion (via " momentum" , p ) p = m v , F ext = d p /dt A mass moving in a circle undergoes centripetal acceleration a centr = v 2 / r Conservation of linear momentum : Isolated system ( Σ F ext = 0) Æ Δ p =0 ; p f = p i m 1 v f1 + m 2 v f2 = m 1 v i1 + m 2 v i2 A moving mass has energy of motion, " Kinetic Energy " (SI joule, "J") KE = ½ m v 2 (a scalar) A spring being compressed pushes back proportional to compression F = - k x A compressed spring has energy of compression, elastic " Potential Energy " U = ½ k x 2 For conservative forces, mechanical energy is conserved E = KE+PE = constant (W nc =0) Electromagnetics: Electric Charge
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