Question

A small stone of mass 0.5 kg is tied to the end of a string of length 1 m and whirled in a horizontal circle at a uniform speed of 4 m s–1. The centripetal force acting on the stone is:

In which one of the following situations does the body undergo uniform circular motion?

Case study: A car of mass 800 kg goes around a circular bend of radius 40 m on a level road at a uniform speed of 20 m s–1. The centripetal force required to keep the car on its circular path, and the agency providing this force, are respectively:

Read the following statements about a body moving with a uniform speed along a circular path of radius r and identify the correct option: (I) The body has a constant velocity, since its speed is constant. (II) The body has a non-zero acceleration directed at every instant towards the centre of the circle. (III) An external centripetal force is necessary to keep the body moving along the circular path. (IV) In the absence of any such external force, the body would move tangentially to the circle in a straight line, in accordance with Newton's first law.