Chapter 3 - Circular Motion Flashcards
1
Q
Angle (radians) = ?
A
Arc length/radius
θ = s/r
2
Q
Define one radian?
A
The angle subtended at the centre of a circle by an arc of equal length to the radius of the circle.
3
Q
Define centripetal force?
A
The net force acting on an object moving in a circle; it is always directed towards the centre of the circle.
4
Q
Centripetal force equation and centripetal acceleration equation?
A
F=(mv^2)/r
Since a=F/m
Centripetal acceleration, a?
a = (v^2)/r
5
Q
How to calculate orbital speed?
A
Centripetal force = (mv^2)/r is provided by the Earths gravitational pull =mg.
Therefore:
(mv^2)/r = mg
So:
(v^2)/r = g
6
Q
Define angular displacement?
A
The angle through which an object moves in a circle.