equilibrium position: the position where the resultant of all forces acting is zero
forced frequency: the frequency at which one object attempts to make a second object vibrate
mechanical resonance: the tendency of a system to oscillate at maximum amplitude at a specific frequency, known as the resonant frequency
oscillate: to move back and forth at a constant rate
piezoelectricity: the ability of certain crystals to change shape when a voltage is applied across them or to produce a voltage when a force is applied to them
radian: a unit used to measure angles that is calculated as arc length divided by radius
resonant frequency: the frequency at which a system naturally vibrates
restoring force: a force that causes an object to return to an equilibrium position
simple harmonic motion: a repeating motion about a central equilibrium point caused by restoring forces
spring constant: a measure of the stiffness or strength of a spring (the k in Hooke’s law)