Physics
A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed with the help of hand.
Answer the following questions:
(a) Is the velocity of stone uniform or variable?
(b) Is the acceleration of stone uniform or variable?
(c) What is the direction of acceleration of stone at any instant?
(d) Which force provides the centripetal force required for circular motion?
(e) Name the force and its direction which acts on the hand.
Answer
(a) Velocity of stone is variable.
(b) Acceleration of stone is variable.
(c) The direction of acceleration of stone at any instance is to the centre of circular path.
(d) The Tension in the string provides the centripetal force.
(e) The force acting on the hand is the reaction tension force, directed away from the center.
Related Questions
Explain the meaning of uniform circular motion. Why is such motion said to be accelerated?
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In your diagram show the direction of velocity at any instant.
A uniform circular motion is an accelerated motion. Explain it. State whether the acceleration is uniform or variable? Name the force responsible to cause this acceleration. What is the direction of force at any instant? Draw diagram in support of your answer.
A small pebble tied at one end of a string is placed near the periphery of a circular disc, at the center of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre.
(a) What will be your observation when you are standing outside the disc? Explain.
(b) What will be your observation when you are standing at the centre of the disc. Explain.