SHM Flashcards
SHM
An oscillation in which the a of an object directly ∝ to its displacement from midpoint + directed towards the midpoint
What if displacement is max when t= 0
Cos
Free vibrations
- no E transfer to/fro surroundings
- oscillates at natural Hz
- constant + max amplitude
Forced vibrations
• oscillation due to external periodic driving force
Resonance
Driving Hz = natural hz
• increasing amplitude to max
Examples of resonance
- radio
* air in organ pipes
Damping
Force which causes an oscillating object to lose E ∴ causes A to decrease
Critical damping
Reduced A in shortest possible time
Centripetal a
a of an object moving w/circular motion + directed to centre
Centripetal f
F on an object moving w/circular motion + directed to centre + causes objects curved path
What kind of oscillator keeps ticking in regular time intervals
Isochronous Oscillator
Why does potential energy transfer into kinetic?
The restoring force does work on the object
What is the sum of potential and kinetic energy called in SHM
Mechanical energy
Describe the phase relationship between the oscillator and the driver when at resonance
The driver displacement is 90° out of phase
