Chapter 2 - Motion In A Circle

Question 0

What is angular displacement?

Answer 0

The total angle displacement travelled from the starting point

Question 1

What is uniform circular motion?

Answer 1

When an object rotates at a steady rate

Question 2

What is angular speed?

Answer 2

The angle an object moves through per second

Question 3

What is the unit of angular speed?

Answer 3

Rad s^-1

Radians per second

Question 4

Why does the velocity of an object moving in a circle constantly change for a constant speed?

Answer 4

The velocity is a measure of not only speed but direction. Even though the speed is constant, the direction is always changing, therefore, the velocity is constantly changing

Question 5

What is the definition of centripetal acceleration?

Answer 5

The acceleration of an object in circular motion towards the centre if the circle.
(Centripetal means ‘towards the centre of the circle’)

Question 6

What is the definition of the centripetal force?

Answer 6

The resultant force on an object moving round in a circle. It acts towards the centre.
(Centripetal means ‘towards the centre of the circle’)