Simple Harmonic Motion Pendulum
The motion of the pendulum has explained here, when the bob is slightly moved to one side (say right), to extreme position A (above figure) and left free, it dose not stay there. It moves towards mean position O with increasing speed. Its speed become maximum at mean position. Due to inertia the bob dose not stay at O but over shot to the other side (left) and continues moving ahead with decreasing speed. The speed become zero at extreme position B, where the bob comes to rest momentarily. From B, the bob return back to O and continues moving towards right extreme A.
- Displacement : At any moment, the distance of bob from mean position, is called displacement. It is a vector quantity.
- Amplitude : Maximum displacement on either side of the mean position, is called amplitude. In the above figure OA and OB measure amplitude.
- Vibration : Motion from the mean position to one extreme, then to other extreme and then back to mean position, is called one vibration.
- Oscillation : Motion from one extreme to other extreme, is called one oscillation. Thus, one oscillation is half vibration.