Define free vibrations forced vibrations and resonance
Answers
Answer:
Forced Vibrations & Resonance. Free vibrations are oscillations where the total energy stays the same over time. This means that the amplitude of the vibration stays the same. ... Forced vibrations occur when the object is forced to vibrate at a particular frequency by a periodic input of force.
Answer:
Free vibrations: A body capable of vibrations is
said to perform free vibrations when it is disturbed
from its equilibrium position and left to itself.
In the absence of dissipative forces such as fric-
tion due to surronding air and intemal forces, the
total energy and hence the amplitude of vibrations
of the body remains constant. The frequencies of the
free vibrations of a body are called its natural
frequencies and depend on the body itself.
In the absence or a maintainin5 torce, in Practice,
the total energy and hence the amplitude decreases
due to dissipative forces and the vibration is said to
be damped. The frequency of damped vibrations is
less than the natural frequency.
2) Forced vibrations : The vibrations of a body in
response to an external periodic force are called
forced vibrations.
The external force supplies the necessary energY
to make up for the dissipative losses. The frequeney
of the forced vibrations is equal to the frequency of
the external penodic torce.
The amplitude of the forced vibrations depends
upon the mass of the vibrating body, the amplitude
of the external force, the difference between the
natural frequency and the frequency of the periodic
force, and the extent of damping.