Further mechanics Flashcards
What is angular speed
The angle an object rotates through per second
What is simple harmonic motion
When acceleration is directly proportional to the displacement but in the opposite direction
In circular motion which way is the force
Towards the centre
When is ek max in simple harmonic motion
At the equilibrium point
What is the name for the sum of kinetic and potential energy
Mechanical energy
What is he graph of displacement-time
The cosine graph which a maximum value of amplitude
What’s the graph of velocity-time
-sine graph with a maximum value of wA
What is resonance
When an object is forced to vibrate at its natural frequency by a periodic input force
What are forced vibrations
An object is forced to vibrate at a particular frequency by a periodic input force
What does damping do
Reduces the amplitude and the natural frequency.
What is damping
The dissipation of energy
What are free vibrations
An oscillation where the total energy remains constant over time, therefore the amplitude will stay constant
What is critical damping
When the amplitude is reduced to 0 in the minimum time possible
What is mechanical energy
The sum of kinetic and potential energy
Does amplitude affect frequency and time period
No
What’s a forced vibration
When an object is forced to vibrate at a particular frequency by a periodic input force
When will a forced vibration be in phase
If the driving frequency is less than the resonant frequency
What happens if the driving force frequency is higher than the resonant frequency
They will become out of phase as the oscillator won’t be able to keep up
How should you find the time period for one oscillation
Measure the time for at least several oscillations and then take an average
What is damping used for
The reduce the effect of resonance, on structure and in sound proof rooms
Give an example of a system which uses critical damping
Car suspension system
When is acceleration maximum
At the maximum displacement
What apparatus should you use when measuring oscillations
A fiducial marker
What are examples of centripetal forces
Tension Gravity Support force Magnetic force Friction
