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periodic motion
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Gravity
Terms in this set (21)
Periodic Motion
refers to motion that is repeated at regular intervals of time.
Equilibrium position
also known as resting position
- The position assumed by the body when it is not vibrating.
Restoring force
is a force that tends to restore a body from its displacement to its equilibrium position
Amplitude (A)
the maximum displacement of a body from its equilibrium position.
Period (T)
the time required to make a complete to-and-fro motion.
-usually expressed in seconds
Cycle
- one complete to-and-fro
frequency
the number of cycles per unit of time.
- SI unit is hertz (Hz)
One hertz is equal to one cycle per second.
shm
- Type of periodic motion where the restoring force is proportional to the displacement of the body from its equilibrium position. This restoring force acts in a direction opposite that of the displacement.
x=0
that the oscillating body is moving at its maximum speed when .
shm
a projection of uniform circular motion along a diameter.
CHRISTIAAN HUYGENS
invented the grandfather's clock in 1658.
Henry Clay Work
entitled "Grandfather's Clock"
PENDULUM
Any object which can swing freely from a pivot point under the influence of gravity.
-may be simple or physical
SIMPLE PENDULUM
Consists of a concentrated mass called the bob suspended by a light thread and attached to a fixed support as shown in figure 8-6.
The period of a simple pendulum is directly proportional to the square root of its length
The period is inversely proportional to square root of the acceleration due to gravity
The period is independent of the mass of the bob
The period is independent of the angular amplitude if angular displacement is small, say less than or equal to 10 °
laws of simple pendulum
Physical pendulum
one where the hanging object is a rigid body.
Damped harmonic oscillation
An object initially set into vibration will have its amplitude continuously decreasing due to frictional effects. Eventually, the object will stop moving.
UNDERDAMPED OSCILLATION
the system oscillated with decreasing amplitude until it becomes zero
FORCED VIBRATION
every simple harmonic oscillator has its natural frequency. However, if such system is subjected to an external force
enrico caruso
Shattering of wine goblet by operatic tenor _____ while singing and collapsing of buildings and other structures during earthquakes are some of the effects of resonance.
RESONANCE
the frequency of force matches the natural frequency of the vibrating system
;