The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body ___________________?
Correct answer: B. 5 cm
- A. 10 cm
- B. 5 cm
- C. 15 cm
- D. 7.5 cm
Explanation
During one complete vibration, the body travels from one extreme to the other and back, giving a total distance of 4A. Thus 4A = 20 cm, so A = 20 cm/4 = 5 cm. Students may choose 10 cm by using only the distance between the two extreme positions, which is 2A.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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