PHYS 1501Q Lecture Notes - Lecture 9: International System Of Units, Switch, Inertial Frame Of Reference
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Physics 1501q - lecture 9 - linear dynamics: newton"s laws 9/14/18. Key (in si units): t = time (s) x = distance (m) v = velocity (m/s) a = acceleration (m/s 2 ) = change in g = gravity = 9. 81 m/s 2 m = mass (kg) Mass (m): an object"s property that determines how hard it is to change its velocity. Force (f): the thing responsible for an object"s change in velocity. An object subject to no external forces is at rest or moves with constant velocity (if viewed from an inertial reference frame) Inertial reference frames: frames in which newton"s laws are valid non-accelerating reference frames. In this course, we will consider earth to be an inertial reference frame. An object at rest will remain at rest. Force causes acceleration (not the other way around) F net = ma = m * dv/dt = d/dt (mv) f net = dp/dt.