Mass On Spring - Hand Held
To demonstrate the concept of resonance and the idea of phase shift at resonance.◙
Mass on spring, hand.
The mass on the spring has a natural frequency, which can be demonstrated by simply holding one end of the spring a rest and allowing the mass to oscillate freely. Demonstrate resonance as follows: (1) With the mass hanging at rest, move your hand very slowly up and down. The mass follows your hand, showing that the mass and the driving force stay in phase for driving frequencies far below the natural frequency of the oscillator. (2) With the mass hanging at rest, move your hand very rapidly up and down. The mass moves opposite to your hand, showing that the mass and the driving force stay out
Shirin Haque-Copilah, Extremely simple demonstration of forced oscillation, AJP 64, 507-508 (1996).