motions in a circle

Question 1

Angular Displacement definition

motions in a circle

Answer 1

ratio of arc length to the radius of a circle

Question 2

Radian definition

motions in a circle

Answer 2

• one radian = the angle subtended at the centre of a circle by an arc equal in length to the radius
• 360 degress = 1 radian

Question 3

Angular Velocity (w) definition

motions in a circle

Answer 3

rate of change of angular displacement

Question 4

Centripetal Force defintion

motions in a circle

Answer 4

the resultant force acting on an object causing its motion in a circle