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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