circular motion definitions

Question 1

define the radian

Answer 1

one radian is the angel subtended at the centre of a circle by an arc of length equal to the radius of the circle

Question 2

define centripetal force

Answer 2

the net force acting on an object describing a circular path. It is always directed towards the centre of the circle

Question 3

define centripetal acceleration

Answer 3

The acceleration towards the centre of the circle that holds the object in elliptical orbit a=v²/r

Question 4

define the period

Answer 4

the time taken for one complete oscillation