Vocabulary
wave, sound, vibrations, wavelength, frequency, amplitude, peak, trough, undulating, mechanical waves, oscillate, surface waves, transverse wave, perpendicular, longitudinal wave, parallel, period, pitch, wave speed, magnets, electromagnet, electricity, magnetic field, magnetic force, attract, repel, north pole, south pole, contact force, non-contact force, atoms, protons, neutrons, electrons, friction, polarize, static charge, batteries, electric current, conductors, non-conductors, insulating materials, polarize, magnets, electromagnet, electricity, magnetic field, magnetic force, attract, repel, north pole, south pole, contact force, non-contact force, atoms, protons, neutrons, electrons, friction, polarize, static charge, batteries, electric current, conductors, non-conductors, insulating materials, polarize