NATS 1720 Lecture Notes - Lecture 4: Net Force, Restoring Force
30 Nov 2015
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Document Summary
Change of position implies velocity (rate of change of position - with time) Objects tend to maintain their state of motion (velocity) in the absence of forces. Acceleration = rate of change of velocity (speed and/or direction) Acceleration (increases with applied force, decreases with object"s mass inertia) a = force/mass = f/m f = m x a. Suppose an object expense a force that gives it an acceleration of 0. 2m/s^2. V (t= 10 seconds) = a x t = a^2m/s^2 x 10 seconds = 2m/s. The motion (future) is completely predicted by the acceleration. If an object exerts a force on a second object, the second exerts an equal and opposite force on the first. At rest, the forces acting are in balance (zero net force) > defines equilibrium to which motion will be described. If system is disturbed (away from equilibrium), then forces no longer balance. Net force <=> acceleration (restoring force - wants to re-establish equilibrium)
