Chapter 2- Motion In A Circle Flashcards
Angular displacement def
Is the angle radians where
[] = arc length (s) / the radius (r)
Angular velocity
The AV of an object is its rate of change of angle, measured in radians/second
Angular velocity unit
Omega (w)
Explanation of angular velocity on a playground roundabout
Same angular velocity for everyone
But the further you stand away from the centre the faster you are travelling
Angular velocity eq for spinning on earth
w= 2pie / T
When something turns at a steady speaks what type of pull do you need?
A centripetal pull
Centripetal def
Means towards the centre of a circle
A force seeking the centre of the circle
Centrifugal def
Means away from the centre
Centripetal acceleration def
The radially inwards acceleration, perpendicular to the tangential velocity
Centripetal acceleration eq
CA = v^2 / r = r w^2
Investigating centripetal force method
Using a rubber bung in a thin string
Held at point if glass tubing with weight at other end
Rotated by person
Graph to calculate m in eq
F= mrw^2
Draw graph of F against rw^2
Line would go straight through origin
Gradient would be m (mass)
Resultant force eq
Fres = mv^2 / r
In situations where someone feels weightlessness they are actually…
Briefly in free fall (accelerating downwards at g= 9.8 m/s^2 )