4.B Energy
It is incorrect that most physics textbooks say energy is the “capacity to do work”, because some systems have energy, yet still can’t do work! So think about it intuitively, for example, Miley Cyrus is really energetic 
!
4.B.1 Kinetic energy (KE = mv2/2, units)
More info: http://phys23p.sl.psu.edu/phys_anim/mech/embederQ2.1801.html
4.B.2 Potential energy
4.B.2.a gravitational, local (PE = mgh)
4.B.2.b. spring (PE = kx2/2)
4.B.2.c. gravitational, general (PE = –GmM/r)
4.B.3 Conservation of energy
4.B.4 Conservative forces
4.B.5 Power, units
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