Which one of the following terms describes an oscillator for which the degree of

Question

Which one of the following terms describes an oscillator for which the degree of damping is just enough to stop the system from oscillating? a. critically damped b. underdamped c. lightly damped d overdamped e. resonating An oscillator is subjected to a damping that is proportional to its velocity. A sinusoidal driving force is applied to it. After a suitably long time has passed a. the amplitude of oscillation increases steadily with time. b. the amplitude of oscillation decreases steadily with time. c. the amplitude of oscillation is constant. d. the amplitude of oscillation decreases with time only if the damping constant is sufficiently large. e. the amplitude of oscillation increases over some portions of the cycle and decreases over other portions.

Explanation / Answer

3. a. critically damped

Critical damping occurs when the resistive forces are 'just enough' to prevent an ocsillation as you say. Most motor car shock absorbers are made slightly underdamped, this still gives a good ride without too much 'boucing' but also gives the car quicker responses.

4. c. the amplitude of oscillations is constant

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