0Concept 1: Circular Motions is mostly based on two or three objects moving around a circular track.
In such cases the relative speed becomes effective speed of the bodies.
Let us assume the three objects are moving with a speed of a, b & c on a track of length L. (a>b>c)
1) If two bodies are moving in the same direction, their relative speed is (a-b).
2) If two bodies are moving in the opposite direction, their relative speed is (a+b)
Number of distinct Points at which body meets on a track:
1) If they are moving in same direction, they will meet at (a-b) distinct points, where a and b are coprimes
2) If they are moving in opposite directions, they will meet at (a+b) distinct points, where a and b are coprimes
3) All these points will be equidistant from each other.
Note: If they aren't coprimes then cancel the common part, make them coprime (a:b) and then use the above points.
Ex 1: If two bodies are moving in the opposite direction at speed 7 and 19, then they will meet at (7+19) = 26 distinct points on the track.
Ex 2: If two bodies are moving in the same direction at speed 6 and 15, (6:15 :: 2 : 5)then they will meet at (5-2) = 3 distinct points on the track.
