CINEMA SECOND CLUB

It’s BEGIN....

Please SIT On YOUR Chair!!!

SIMPLE HARMONIC MOTION : PENDULUM

CLOCKAdinolfi Pasaribu

Ahmad JuhaidiArfin Wijaya AULIA ASTRICO P

Yudisthira Oktaviandie

HOW COULD A PENDULUM USED

AS TIMEKEEPER

S?

From its discovery around 1602 by Galileo Galilei, the regular motion of pendulums was used for timekeeping, and was the world's most accurate timekeeping technology until the 1930s.

The word 'pendulum' is new Latin, from the Latin pendulus, means 'hanging‘

The simple gravity pendulum is a weight (bob) on the end of a massless cord suspended from a frictionless pivot.

When given an initial push, it will swing back and forth at a constant amplitude.

The period of swing of a simple pendulum depends on its length, and the local strength of gravity.

If the amplitude is limited to small swings, the period (T) or the time taken for a complete cycle of a simple pendulum, is:

For small swings, the period of swing is approximately the same for different size swings. So, the period is independent of amplitude.

This property, called isochronism, is the reason pendulums are so useful for timekeeping.

Successive swings of the pendulum, even if

changing in amplitude, take the same amount of

time.

External factors:

Temperature

The largest source of error in early pendulums was slight changes in length due to thermal expansion and contraction of the pendulum rod with changes in ambient temperature.

Atmospheric pressure

Viscous air resistance slows the pendulum's velocity. This has a negligible effect on the period, but dissipates energy, reducing the amplitude

External factors:

Gravity

Pendulums are affected by changes in gravitational acceleration, which varies by as much as 0.5% at different locations on Earth, so pendulum clocks have to be recalibrated after a move

External factors:

THAkNSFor Your Attention....