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on June 13, 2020
RELATIVE MOTION
When two bodies P and Q are moving in a straight line , the motion of P relative to the motion of Q IS called relative Motion.
- If P moves with velocity higher than velocity of Q in the same direction along a straight line , the velocity of P relative to velocity of Q is the difference in the velocity of P and Q.
- If P moves with velocity higher than or equal to velocity of Q in opposite direction along a straight line , the velocity of P relative to velocity of Q is the addition of the velocity of P and Q.
- If P and Q moves at certain angle to each other the relative velocity is found by adding the velocity of Q reversed to velocity of P using Parallelogram law of vectors.
Example
A car M travelling at due South of a place K and bus B travelling at due East of K. What is the velocity of M relative to B ?
Solution
See fig above
The direction is the angle which R makes with East
Supposed these vehicles travel in a straight line. What is the velocity of M relative to B ?
- If they travel in opposite direction
- If they travel in the same direction
Read more about PHYSICS for High Schools
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relative motion
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