Mechanics Flashcards
Define linear velocity
The speed at which an object travels, at a tangent to the circle
Define angular velocity
What is the unit?
How far an object turns through in a given time
Rads -1
Define time period
Define frequency
Circular motion
Time taken for one complete rotation
Number of rotations per second
What forces is centripetal force split into, during vertical motion?
Weight and reaction force
What is the reaction force of an airplane called?
Lift
Define simple harmonic motion
An oscillation in which the acceleration of an object is directly proportional to its negative displacement from equilibrium
Describe the link between displacement, velocity and acceleration in an object with SHM
As displacement increases, the negative acceleration increases and velocity decreases
At max displacement, v=0
What is the amplitude in SHM?
What happens when the displacement is equal to the amplitude?
The maximum displacement
Velocity = 0
Why does T of SHM remain constant if v increases?
As v Increases, x decreases so T remains constant
Define free vibration
A vibration which involves no transfer of energy to surroundings
Define forced vibrations
An oscillation which is due to a driving force, it has an external driving frequency
What happens when the driving frequency approaches the natural frequency?
The amplitude increases rapidly and the system gains more energy from driving force
What is the phase difference between the driver and oscillator
- at resonance
- when d frequency»_space; n freq
- when d frequency «_space;n freq
90 degrees out of phase
Completely out of phase
In phase
Define damping forces
Forces that cause an oscillating system to lose energy, causing amplitude to decrease over time
What are the different types of damping?
Heavy
Light
Critical
Over
