Ch16 circular motion Flashcards
1
Q
Converging between radians and degrees?
A
D to R = x pi/180
R to D = x 180/pi
2
Q
What do you know about velocity in circular motion?
A
- Speed is constant
- Velocity is changing as the direction of v changes.
3
Q
Why is speed constant if there is a force acting?
A
- F is acting towards the centre.
- V is perpendicular to F.
- hence there is no work done,
as W = Fdcosθ, θ=90,
W = 0 - hence the speed is constant.
4
Q
What do you know about centripetal acceleration?
A
- a is acting towards the centre.
- a is changing as V is changing.
- centripetal acceleration = V^2 / r
5
Q
what do you know about centripetal force.
A
- F is acting towards the centre
- F =ma
hence F =mv^2 / r
6
Q
angular velocity?
A
-angular velocity = ω
ω = θ / t
unit = rads^-1
7
Q
rpm to rads^-1
A
rpm to rads^-1:
rpm x2pi /60
8
Q
Circular motion at an angle
A
Ry =mg
Ry = Rcosθ
Rcosθ =mg
Rx = Fc = mv^2/r
Rx = Rsinθ
Rsinθ = mv^2/r
