Chapter 16 - Circular Motion

Question 1

What does ‘w’ stand for?

Answer 1

Angular velocity

Question 2

What are the formulas linking angular velocity and angle?

Answer 2

w = x / t

‘x’ is angle
‘t’ is time

Question 3

How can angular velocity be calculated using full time period?

Answer 3

w = 2(pi) / T

‘T’ is the time period of a full circle

Question 4

How can angular velocity be linked to frequency?

Answer 4

w = 2(pi)f

‘f’ is frequency of an object around the circle

Question 5

What is uniform circular motion?

Answer 5

A body rotating at a constant speed but a changing velocity

Question 6

How is a uniform circular motion achieved?

Answer 6

Result force acts continually in a direction perpendicular to the body

Question 7

What is the formula between linear velocity and angular velocity?

Answer 7

Linear velocity = Radius x Angular Velocity

Question 8

What is the formula for acceleration in uniform circular motion?

Answer 8

a = v²/r = w²r

Question 9

What is angular velocity?

Answer 9

Angular velocity is the rate of change of angle of a body as it exhibits uniform circular motion

Question 10

What is the units for angular velocity?

Answer 10

Radians/Second

Question 11

What is the centripetal force?

Answer 11

Centripetal force keeps a body moving with a constant speed in a circular path
It acts towards the centre of the circle

Question 12

What is the formula for centripetal force?

Answer 12

F = mv²/r = mw²r

Question 13

What is the source of centripetal force with a string, surface, in the air?

Answer 13

String = Tension
Surface = Friction
Air = Weight