Difference between revisions of "Kinetic Energy"

Revision as of 16:14, October 17, 2007

Kinetic energy represents the energy asociated with the motion of an object.^[1] It is defined as:

K ≡ m v2 / 2

The change of kinetic energy in an object is equal to the total work done on it by a force. In the case of constant force, this can be expressed as:

ΣW = ΔK = mv_f2 / 2 - mv_i2 / 2

Where v_f is speed at t = 0 and _i2 is speed at time = t.

Kinetic energy is a scalar and has the same units as work (i.e. Joule).

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-'''Kinetic energy''' is the [[energy]] of motion.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> Kinetic energy is sometimes denoted by the symbol T, and measured in [[Joule]]s ( 1 Joule = 1 kg(<sup>m</sup>/<sub>s</sub>)<sup>2</sup>). The translational kinetic energy of an object of [[mass]] M, with [[velocity]] V in an [[inertia]]l reference frame is (<sup>1</sup>/<sub>2</sub>)MV<sup>2</sup>.
+'''Kinetic energy''' represents the [[energy]] asociated with the [[motion]] of an object.<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref> It is defined as:
+K ≡ [[mass|m]][[velocity|v]]<small>2</small> / 2
+The change of kinetic energy in an object is equal to the total [[work]] done on it by a [[force]]. In the case of constant force, this can be expressed as:
+Σ''W'' = ΔK = mv<sub>f</sub><small>2</small> / 2 - mv<sub>i</sub><small>2</small> / 2
+Where v<sub>f</sub> is speed at t = 0 and <sub>i</sub><small>2</small> is speed at time = t.
+Kinetic energy is a scalar and has the same units as work (i.e. [[Joule]]).
 ==References==
 <references/>
 [[category:physics]]