Lecture Notes September 5th Newton?s Laws of Motion Newton?s 1st Law - Law of enertia Everything remains at rest or in motion until acted upon by a force. Defines an inertial reference frame Any frame moving with constant velocity relative to inertial frame is itself an inertial frame. Newton?s 2nd Law F=ma assume that inertial mass = gravitational mass Mass vs. Weight Weight is a force due to gravity Weight=mass x gravity Other Forces Apparent Weight N = m(g + a) Friction Fkinetic = ?k N Fstatic ? ?s N Ffriction V Normal Force (n or Fn) always perpendicular to plane mg-down n=mg n-up Tension T? T T? T? T
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