Circular and SHM (C16,17) Flashcards
what is angular velocity
angle of rotation per time
Circular motion which way does the force act
TOWARDS centre
circular motion which way is the acceleration
towards centre
CM which way is the velocity
tangent to circle
What is the centripetal force an example of
a net force or resultant force
Name some common sources of centripetal forces
gravity, friction, tension, normal contact force
What does speed being proportional to centripetal force tell you in relation to circular motion
that more force is needed the faster you go
- e.g. more grip for faster cornering
Why is there weightlessness in a rollercoaster
gravity provides the entire centripetal force meaing that there is no reaction from the rollercoaster cart making you feel weightless
How does gravity change CM
centripetal force must be constant, so tension (or whatever other force) changes
what do you do in a conical CM question
resolve the weight
definition of simple harmonic motion
an oscillating system where the acceleration is directly proportional to its postion from equlibrium
Name 3 key characteristics of SHM
Periodic oscillations about an equlibrium
displacement, velocity and acceleration are sinusoidal
period does not depend on amplitude
which way is acceleration directed in SHM
Towards equilibrium
when is velocity at max
when moving through the equilibrium
when is elastic potential at a max
when at amplitude
