6.1 Flashcards
Damping
The reduction in amplitude of an oscillating object with time, caused by energy lost as heat by friction.
Critical damping
reduces the amplitude to zero in the quickest
Forced vibrations
An oscillation with an external, resultant driving force.
Free Vibrations
An oscillation with no external driving force
Overdamping
is when the damping force is too strong and it
returns to equilibrium slowly without oscillation.
Simple Harmonic Motion
Motion where the acceleration of an object is directly
proportional, and in the opposite direction, to its displacement.
Underdamping
is when the damping force is too weak and it
oscillates with exponentially decreasing amplitude.
What are the conditions of SHM
● Acceleration must be proportional to its
displacement from the equilibrium point.
● It must act towards the equilibrium point.
● a ∝ -𝑥
Resonance
The increase in amplitude of a wave when the driving frequency matches the natural frequency of the system.
Angular speed
the angle an object rotates through per second
Centripetal accelaration
An object moving in a circular path at constant speed has a constantly changing velocity as velocity
has both magnitude and direction, therefore the object must be accelerating
Centripetal force
A force applied always towards the centre of that
circle
Draw a displacement time graph how it oscillates with shm and time
Draw a velocity time graph how it oscillates with shm and time
- sin graph
Draw a acceleration time graph how it oscillates with shm and time
-cos graph
