An example of uniform linear motion is
a group of people marching together in a parade, performing the exact
same steps together. In contrast, an example of non uniform linear
motion is a child going down a slide, as they are constantly changing
speed and position.
Periodic Motion
Periodic motions are defined as any type
of motion that repeats itself over time. Periodic motions are abundant
in nature. Motions such as planetary motion, the motion of moons around
planets, the motion of orbital satellites, the motion of the blades of a
fan, the rotation of an engine are some examples for periodic motions.
Periodic motions can be classified into two main categories. First one
is natural periodic motions, which occur in nature without any external
force; the second type is artificial or man-made periodic motions. These
motions are forced periodic motions such as diesel engines. Periodic
motions can occur either in regular paths such as circles, ellipses or
in irregular paths, which cannot be defined easily. Most of the periodic
motions occurring in irregular paths are forced periodic motions
.
Oscillatory Motion
Oscillatory motions are a type of
periodic motion. An oscillatory motion is usually defined as a
repetitive variation over time. The oscillatory motion can occur over a
middle equilibrium point or between two states. A pendulum is a good
example for an oscillatory motion.
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