3.A Equilibrium
3.A.1 Concept of force, units
Equilibrium means there is no translational (movement) or angular (rotational) acceleration. This does not mean it has to be stationary! It can be moving, but it must be moving with a constant velocity.
Static equilibrium is when
3.A.2 Translational equilibrium (Fi = 0)
3.A.3 Rotational equilibrium (τi = 0)
3.A.4 Analysis of forces acting on an object
More info: http://phys23p.sl.psu.edu/phys_anim/mech/embederQ2.1701.html
3.A.5 Newton’s first law (inertia)
3.A.6 Torques, lever arms
3.A.7 Weightlessness
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