Question

6. A girl is whirling a small ball tied to a string in a
uniform circular path of radius 50 cm with a constant
speed of 4 m s-1. Is the motion uniform circular motion?
What is its contripetal acceleration? If mass of ball be
50 g then what is the magnitude of centripetal force?​

Answer 1

Answer:

In the previous section, we defined circular motion. The simplest case of circular motion is uniform circular motion, where an object travels a circular path at a constant speed. Note that, unlike speed, the linear velocity of an object in circular motion is constantly changing because it is always changing direction. We know from kinematics that acceleration is a change in velocity, either in magnitude or in direction or both. Therefore, an object undergoing uniform circular motion is always accelerating, even though the magnitude of its velocity is constant.

You experience this acceleration yourself every time you ride in a car while it turns a corner. If you hold the steering wheel steady during the turn and move at a constant speed, you are executing uniform circular motion. What you notice is a feeling of