5.2 Circular Motion

Question 1

How many radians are there is 360 degrees?

Answer 1

2pi

Question 2

What are the SI units for angular velocity?

Answer 2

Radians per second

Question 3

What is the definition for angular velocity?

Answer 3

The rate of change of angle

Question 4

How do you calculate angular velocity from time period (T)?

Answer 4

Angular velocity = 2pi/T

Question 5

How do you calculate angular velocity from frequency (f)?

Answer 5

Angular velocity p=2pif

Question 6

What is required for uniform circular motion?

Answer 6

A force that always acts perpendicular to velocity

Question 7

Why doesn’t a centripetal force do any work on an object in circular motion?

Answer 7

The force has no component in the direction of motion/ is always perpendicular to motion

Question 8

How do you calculate the linear velocity from the time period (T) of an object in circular motion?

Answer 8

v=2pir/T

Question 9

How do you calculate linear velocity from angular velocity?

Answer 9

v= angular velocity x radius

Question 10

How is it possible for an object to experience an acceleration but travel at a constant speed?

Answer 10

If acceleration is perpendicular to velocity, the velocity will change direction whilst speed is constant

Question 11

What provides the centripetal force for a car turning a corner?

Answer 11

Friction from the road on the tyres

Question 12

What provides the centripetal force on the moon?

Answer 12

The gravitational attraction of the Earth

Question 13

Apart from friction what contributes to the centripetal force on a banked track?

Answer 13

The horizontal component of the normal reaction

Question 14

If a mass on a string is swung in a vertical circle where is the tension the greatest?

Answer 14

At the bottom of the circle

Question 15

If a mass on a string is swung in a vertical circle where is the tension least?

Answer 15

At the top of the circle