Circular Motion

Question 1

Define radians

Answer 1

the angle subtended at the centre of a circle by an arc equal in length to the radius of the circle.

Question 2

equation for angular velocity, ω

Answer 2

ω =∆θ/T = 2π/T = 2 π f rads^-1

Question 3

define angular velocity

Answer 3

The rate of change in angular displacement with respect to time

Question 4

equation for radian

Answer 4

circumference/radius

Question 5

linear velocity equation

Answer 5

v = ω r

Question 6

another name for angular velocity

Answer 6

angular frequency

Question 7

define centripetal force

Answer 7

The resultant force towards the centre of the circle required to keep a body in uniform circular motion. It is perpendicular to the linear velocity.

Question 8

Is there counter force for centripetal force

Answer 8

no, centripetal force is secondary term of net force. This can be any type of resultant force such as tension, gravity, magnetic force

Question 9

why is there a resultant force for circular motion

Answer 9

object moves in constant speed, but changing direction => change of velocity => acceleration => resultant force

Question 10

centripetal acceleration equation

Answer 10

a = r *ω^2 = v^2 / r ms^-2

Question 11

centripetal force equation

Answer 11

F = m* r ω^2 = m v^2 / r ; N