motion in a circle

Question 1

angular displacement.

Answer 1

angle through which an object turns in a specified direction about a specified axis.

Question 1

radian

Answer 1

the unit for the measurement of angle. 1 radian is that angle subtended at the centre of a circle by an arc equal in length to the radius.

Question 2

angular speed

Answer 2

the rate of change with time of the angular direction of the line joining an object to the axis about which it is rotating.

Question 3

angular velocity

Answer 3

the rate of change with time of the angular direction of the line joining an object to the axis about which it is rotating, in a given direction.

Question 4

centripetal acceleration

Answer 4

the acceleration, directed towards the centre of a circle, of an object moving along the arc of the circle.

Question 5

period (of a circular motion)

Answer 5

time taken for an object to turn through an angle of 2 pi radians

Question 6

frequency (of a circular motion)

Answer 6

the number of compete revolutions per unit time.