PHYS 1C Lecture Notes - Lecture 4: Sine Wave, Damping Ratio, Flagellum
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Let"s assume a spring-mass system is moving on a frictionless horizontal surface. This is an isolated system, therefore the total energy of the system is constant. The kinetic energy is ke= 1. 2mv^2 = 1/2mw^2a^2. Friction reduces the total energy of the system and the oscillation is said to be damped. The damped motion varies depending on many factors. The damped motion can be underdamped, critically damped, overdamped. Lots of examples of simple harmonic motion or oscillations in nature and biology: pendulum, light waves, musical instruments. Flagella movement, ultrasound transducers use piezoelectric effect week 2 page 1. Transfer of disturbance through space without transfer of matter. Are waves that disturb and propagate through a medium. Water waves, waves on a string, sound waves. Electromagnetic waves are a special type of waves that do not require a medium to propagate. Requires a medium that can be disturbed (solid, liquid, gas)
