Unformatted text preview: echanics, the kinetic energy of a "point object" (a body so small that its size can be
ignored), or a rigid non rotating body, is given by the equation (1)
where K is the kinetic energy, m is the mass of the object, and v is the speed of the object.
Note that the kinetic energy increases with the square of the speed. This means, for example, that
if you are traveling twice as fast, you will have four times as much kinetic energy. As a result of this, a
car traveling twice as fast requires four times as much distance to stop. 1 The units for kinetic energy, and therefore all types of energy, are the (kg · m2/s2). This energy
unit is called a joule. Kinetic energy differs from momentum in that it is NOT a vector quantity. An
object has the same kinetic energy regardless of its direction as long as its speed does not change.
2.2 Potential Energy Potential energy is the energy that an object has given its relative positions (configurations) in
the physical system. This form of energy has the potential to change the state of other objects around it,
for example, the configuration or motion.
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