06 Circular Motion

Question 1

Centripetal acceleration

Answer 1

a_c = rω² or a_c = v²/r

Question 2

Why does centripetal force not cause an increase in kinetic energy of a body?

Answer 2

Centripetal force is always perpendicular to direction of motion of the body (in circular motion)

hence work done by centripetal force is zero

Question 3

Angular Displacement

Answer 3

Angular displacement is the angle of rotation of a body about an axis in a specific direction from a reference point

Question 4

Angular Velocity

Answer 4

Angular velocity is the rate of change of angular displacement of a body

Question 5

Angular Velocity

Answer 5

Angular velocity is the rate of change of angular displacement of a body

Question 6

Centripetal Force

Answer 6

According to Newton’s Second Law of Motion, for a body to move at constant speed in a circular path, it must have a resultant external force acting on it to undergo centripetal acceleration. This force is also known as the centripetal force