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Re: Why work before energy in texts



At 12:32 PM -0600 on 10/13/01, Jim Green wrote
(I don't know what you mean by "plus kinematics")


kinematics usually involves the 'Four Magic Equations' of motion.
Each one 'leaves out' one of the four 'variables', d, v, a, or t.

The one that is missing t is usually written

Vf^2 = Vi^2 + 2ad

but can also be written:

1/2 Vf^2 - 1/2 Vi^2 = a d

multiplying through by mass gives us

delta KE = F d which is a 'pretty good' intro of the Work Energy Thm.
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