A particle tied to one of the ends of a string is being rotated about the other end of the string. Which of the following statements is (are) true for an observer who is located at the axis of rotation and rotating along with the string?

Choose at least one answer.

1.	Centrifugal force acts on the particle away from the axis of rotation
2.	No net force (pseudo + real) acts on the particle
3.	Centrifugal force acts on the particle towards the axis of rotation
4.	Coriolis force acts on the particle towards the axis of rotation
5.	The tension in the string provides for the centripetal acceleration

Hi Vaibhav,

Since the observer is rotating along with the string therefore the the frame of reference is an acclerated frame of reference.

He will observe that Particle is not in motion.

According to him a real force ( tension in string ) will act towards the axis of rotation and pseudo force ( centrifugal force because we are in accelarated frame of reference ) will act away from the axis of rotation.

These two forces will balance each other and particle will not be in motion according to the observer.

So the answer 2 is correct. ( no net force ( pseuod + real ) acts on the particle.

Please feel free to ask as many questions u have.

Puneet