Chapter-8. Motion Science class 9 in english Medium CBSE Notes

Uniform Circular Motion : When an object moves in a circular path with uniform speed, its motion is called uniform circular motion. 

Example of uniform circular motion : 

(i) Motion of the moon around the earth

(ii) Motion of the Earth around the Sun. 

(iii) A satellite in a circular orbit around the earth

(iv) A cyclist on a circular track

Total Distance Covered in circular path : 2 π r 

Speed of athlete in circular path : 2 π r / t 

Factors due to which Changing in the velocity : 

(i) Change in magnitude 

(ii) Change in direction

Uniform circular motion is the motion due to change in direction of object on circular path at its each point.