Circular Motion
Define a Radian
The angle measured when the arc length equals the radius of the circle
Define 'Angular Velocity'
The rate of change of an angle
Give 2 different formulas to find Angular velocity and its units
ω = 2πf
ω = 2π/t
rad s^-1
ω = Angular velocity
f = frequency
t =time period
Define 'Uniform Circular Motion'
Where the velocity of an object constantly changes direction, however its speed remains the same
Define 'linear velocity'
The velocity of an object rotating in uniform circular motion
Define 'Centripetal Force'
The force acting perpendicular to the motion, so no work is done on the object so its speed is constant
Centripetal Force always acts towards the centre of the circle what does this mean?
There is also an acceleration at the centre of the circle
Give the formula for linear velocity
v = rω
v = linear velocity
r = radius
ω = Angular velocity
Give 2 formula for Centripetal acceleration
a = v²/r
a = rω²
ω = Angular Velocity
a = Acceleration
v = Linear velocity
r = Radius
Give the 2 formulae for Centripetal force
F = mv²/r
F = mrω²
F = Force
m = Mass
v = Linear Velocity
ω = Angular Velocity
What is one important feature of Centripetal Force
It is a resultant force of the weight and the normal contact force