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

Resultant 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

Question 14

Is the centripetal force actually a force?

Answer 14

The centripetal force is not a type of force, but the name given to the resultant of the forces acting on an object moving in uniform circular motion

Question 15

What is the circular motion formula including the normal force?

Answer 15

mg - N = mv² / r

Used when weight is the centripetal force and there is a normal force

Question 16

What is the difference in the normal force in circular motion on a banked turn?

Answer 16

The normal force has a horizontal component that can act as a centripetal force

Question 17

What is the formula for linear velocity for a suspended object in circular motion?

Answer 17

v² = g * r * tan(x)