Chapter 6

Question 1

What is an angle?

Answer 1

Angle, measured in radians, is equal to the arc length divided by the radius

Question 2

What is angular velocity?

Answer 2

Angular velocity is the rate of change of an angle

Question 3

What is linear velocity?

Answer 3

Linear velocity is the speed of the particle in a direction perpendicular to the radius at that point

Question 4

What is periodic time?

Answer 4

Periodic time is the time taken for one complete revolution, cycle or oscillation

Question 5

What is centripetal acceleration?

Answer 5

Centripetal acceleration is the acceleration of an object travelling in uniform acceleration; it is directed towards the centre of the circle

Question 6

What is centripetal force?

Answer 6

Centripetal force is the force required to maintain uniform circular motion; it is directed towards the centre of the circle

Question 7

State Keplar’s Third Law

Answer 7

The square of the periodic time of a satellite’s orbit around a planet is proportional to the cube of the radius of the orbit (including the radius of the planet) and inversely proportional to the mass of the planet.