repetitive motion at a constant rate - periodic motion, a swinging back and forth motion - oscillating motion, the maximum displacement from the rest position - amplitude, SI unit for frequency - Hz, effect of increasing the mass of a pendulum  - increases period, the effect of friction on repetitive motion - damping, first practical use of a pendulum - seismoscope, the effect of shortening a pendulum's arm - shortens the period, transported by all waves - energy, type of wave that travels down a string - transverse, type of wave produced by sound - longitudinal, the bending of waves around edges - diffraction, type of forces that can do work - field and contact, type of motion that occurs when a bat hits a ball - linear, one complete back and forth motion - cycle, time it takes to complete one cycle - period, a rigid bar or weight tied to a string - pendulum arm, can be transferred with or without matter - energy, waves that require matter to transmit energy - mechanic waves, waves that do not require matter to transmit energy - electromagnetic waves, causes the speed of a wave to change - refraction, the area of a pendulum where potential energy is greatest - peak of swing, the area of a pendulum where kinetic energy is greatest - bottom of swing, fastest waves in the universe - electromagnetic, short burst of waves - pulse, the bounding off of a wave - reflection, two waves interfering in phase - constructive interference, two waves interfering out of phase - destructive interference,

Physical Science Chapter 12

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