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1. A particle has no extend.
Its position is described by a single coordinate.
A real object may be considered a particle if all points on the particle
undergo the same displacement in the same delta-t.
2. A particle cannot rotate or vibrate; it can only translate.
3. A particle can oscillate. For example, a particle can be attached to a
spring which provides a restoring force and causes the particle to oscillate.
(The spring is not part of the particle)
4. A system may consists of many particles. If the particles are oscillating,
then the system is said to vibrate. Such examples include a plucked violin
string, a stuck bell or a running motor.