Download Oscillatory Motion and Wave Propagation

Oscillatory Motion
Physics 7(A)
Oscillatory Motion
Learning Objectives
• Examine and describe oscillatory motion
• Examine and describe wave propagation in various types
of media
Oscillatory Motion
• Oscillation – a repetitive
change over time that
occurs about an
equilibrium point
• Period – the amount of
time required to
complete an oscillation
– Measured in seconds, s
• Examples
–
–
–
–
–
Mass on a spring
Pendulum
Playground swing
Vibration of guitar strings
Electromagnetic waves
Energy in Oscillatory Motion
• At the top of its swing,
the pendulum has
maximum gravitational
potential energy and
minimum kinetic energy
• At the bottom of its
swing, the pendulum has
maximum kinetic energy
and minimum gravitational
Energy constantly converted
potential energy
between gravitational potential
energy and kinetic energy
Description of Oscillatory Motion
• Wave – an oscillation
transferred through
space with little or no
disturbance of the
medium it moves
through
• Can be represented by a
displacement versus
time graph of a
pendulum
Types of Waves
• Mechanical waves –
require a medium to
travel through
– Ocean waves travel
through water
– Sound waves travel
through the air
• Electromagnetic waves –
do not require a medium
to travel through
– Visible light
– Radio waves
• Transverse waves –
particles move
perpendicular to the
motion of the wave
– Electromagnetic waves
• Longitudinal waves –
particles move parallel to
the motion of the wave
– Sound waves
– Pressure waves
Oscillatory Motion
Learning Objectives
• Examine and describe oscillatory motion
• Examine and describe wave propagation in various types
of media