Further Mechanics Flashcards
What is the definition of centripetal force?
The resultant force acting on an object in circular motion, always acting towards the centre
Why does an object travelling in a circle at constant speed accelerate?
The direction of the object is constantly changing, and therefore velocity is constantly changing
In which direction does centripetal acceleration act?
Towards the centre
What is the definition of simple harmonic motion?
An oscillation in which the acceleration of an object is directly proportional to its displacement from the equilibrium and is directed towards the equilibrium
What is a free vibration?
When no energy is transferred between the oscillator and its surroundings and the oscillator oscillates at its natural frequency
What is a forced vibration?
When a system is made to oscillate by a periodic driving force. The oscillator will oscillate with the same frequency as the driver
What is resonance?
When the driving frequency matches the natural frequency of the oscillator. There is a rapid increase in amplitude of the oscillations
What is the phase difference when the driving frequency< the natural frequency
0 rad (in phase)
What is the phase difference when the driving frequency = the natural frequency?
Pi/2 rad
What is the phase difference when the driving frequency > the natural frequency?
Pi rad (in anti-phase)
What is the condition for simple harmonic motion?
a is directly proportional to -x
