## Friday, June 22, 2012

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### Relative motion

Relative motion
Motion of a body is described in the terms of motion of another body is called relative motion

Relative velocity
The relative velocity is defined as the velocity of the body with respect to another body
"OR"
It is also defined as a distance between of two bodies.

There are three cases of relative motion . They are:-

Case 1
When in opposite  direction

VAB = Relative velocity

timetaken

= 75 km + 90 km
1hr
= 165 km/hr

Conclusion
VAB VA+VB

Case 2

When in same direction

VAB
100-80

1
= 20 km/hr
Conclusion
VAB VA-VB

VAB VB-VA

Case 3

If two bodies are moving uniformly i.e. they are moving in the same direction with same velocity then the relative velocity = 0