Question

a particle is moving in a circular path or radius r what would be the distance travelled by the particle and its displacement ?
(a) after it completes half a circle (b) if it completes three and a half round of the circle
(c) if it completes one full round of the circle

In which two cases is the particle displayed equally ?​

Answer 1

Answer:

The displacement is the minimum distance between the initial position and final position.

Suppose a particle starts at a point A at the periphery of the circle and after covering half the circle, particle is at point B.

The minimum distance between points A and B is AB which is also the diameter of the circle.

Therefore, displacement after covering half the circle =Diameter=2r

Answer 2

Answer:

Hence displacement will be 2r where, R is the radius of the circle. The distance travelled by the particle for complete half revolution will be half the circumference. Hence distance travelled will be πr.