Uniform circular motion and Non-uniform circular motion
Uniform circular motion
1.) Linear motion of object along the circumference of circle with constant speed is known as uniform circular motion.
2.) The time required to complete one revolution i.e. period of motion is always constant.
3.) In every period (T) the distance travelled by object is always equal to circumference of circle.
4.) Speed of object performing uniform circular motion is given as,
Where ‘r’ is radius of circle and ‘T’ be the period of circular motion.
5.) Since the speed of object performing uniform circular motion is constant at all points on circumference of circle, the kinetic energy of particle at every point is also remains constant.
6.) Force acting on each point on circumference of circle is always directed towards the centre of circle and along the radius, this force is known as centripetal force which is given as
F = (mv2)/r
7.) Magnitude of force or tension is also constant during uniform circular motion.
8.) Eg. The motions of tip of second hand / minute hand of clock, motion of blades of fan are some examples of uniform circular motion.
Non-uniform circular motion
1.) Linear motion of object along the circumference of circle with variable speed is known as non-uniform circular motion.
2.) The time required to complete one revolution i.e. period of motion does not remains constant.
3.) Since the period is different speed of object in non-uniform circular motion is different at different point.
4.) Average speed of object performing non-circular motion is given as for given rotation only is given as,
Where ‘r’ is radius of circle and ‘T’ be the period of circular motion.
5.) Since the speed of object performing non-uniform circular motion is different at all points on circumference of circle, the kinetic energy of particle at every point is also changes from point to point
6.) Force acting on each point on circumference of circle is always directed towards the centre of circle and along the radius, this force is known as centripetal force which is given as
F = (mv2)/r
7.) Magnitude of force or tension is different at every point on the circumference of circle.
8.) Eg. Children enjoying motion in giant wheel, stone attached to string and rotated in vertical circle are some examples of non-uniform circular motion.