
Concept explainers
For a simple harmonic oscillator, when (if ever) are the displacement and velocity vectors in the same direction? When are the displacement and acceleration vectors in the same direction?

For a simple harmonic oscillator, when are the displacement and velocity vectors in the same direction andwhen are the displacement and acceleration vectors in the same direction.
Answer to Problem 4Q
Solution:
When going from equilibrium position to maximum displacement (either up ordown), the displacement and velocity vectors point in the same direction.
The displacement and acceleration vectors never point in same direction.
Explanation of Solution
For a simple harmonic oscillator the displacement and velocity vectors are in the same directionwhile the oscillator is moving away from its equilibrium position, one-half of the time. Acceleration vector is always opposite to the position vector, and never in the same direction.
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Physics: Principles with Applications
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