11. The approximating function " F 1 " is linear, so it will describe simple harmonic motion . 12. This cycle of simple harmonic motion repeats. 13. The body moves with simple harmonic motion . 14. This means that if a weight is hung on a spring it will oscillate with simple harmonic motion . 15. If the driving point moves in simple harmonic motion , the pendulum's motion is described by the Mathieu equation. 16. :: I assume he means simple harmonic motion of a spring at its average length which is getting smaller. 17. I've differentiated twice to show that it's simple harmonic motion , but I don't know where to go from there. 18. To a first approximation, the motion in a normal vibration can be described as a kind of simple harmonic motion . 19. Our article on Simple harmonic motion contains the very formula you need .-- Howard Train 03 : 55, 14 May 2006 ( UTC) 20. The angular deflection also follows a simple harmonic motion , which lags behind the side to side motion by a quarter of a cycle.
