(1) Centripetal force and centrifugal force.
(2) Streamline flow and turbulent flow.
(3) Simple pendulum and a conical pendulum.
(4) Free vibrations and forced vibrations.
(5) Forced vibrations and resonance.
(6) Progressive and Stationary waves.
(8) Stationary waves and heats.
(9) Interference and diffraction.
(10) Electric field intensity and electric potential.
(11) Volt and electronvolt,
(13) Potentiometer and voltmeter
(16) Step-up and step-down transformers.
(17) Resistance and reactance,
(18) Nuclear fission and nuclear fusion.
