Kinematic of Circular Motion

Question 1

Define the radian.

Answer 1

Unit of measurement of an angle: 1 Radian=57.3 degrees. 1 radian of angle is subtended when the arc length of a circle is equal to the radius.

Question 2

Define period.

Answer 2

The time taken for one complete oscillation (S.I units of seconds).

Question 3

Define Angular velocity.

Answer 3

Rate of change of its angular displacement. ω=2πf
ω= Angular velocity (rads^-1)
f = frequency (Hz)
T =time period (s)

Question 4

Define Linear speed.

Answer 4

v=rω where v is the linear speed (ms^-1), ω is the angular velocity (rads^-1) and r is the radius (m).