Relative Velocity
Chapter Name : Motion In A Straight Line |
Sub Topic Code : 101_11_03_07_01 |
Topic Name : Relative Velocity |
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Sub Topic Name : Relative Velocity |
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Introduction
Relative velocity of a particle A with respect to B is defined as the velocity with which A appears to move if B is considered to be at rest. In other words, it is the velocity with which A appears to move as seen by B considering itself to be at rest.
Pre-Requisites:
Motion, Velocity, Acceleration
Activity:
Develop knowledge of motion in day to day life. Understanding the concept of relative velocity.
Real Life Question:
Why do the objects outside the train appear to move to a passenger sitting inside the train?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Motion | Change in position of an object with time. |
| Relative velocity | Velocity with which A appears to move if B is considered to be at rest. In other words, it is the velocity with which A appears to move as seen by B considering itself to be at rest. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Aero plane | Observe how the aero plane moves relatively with respect to wind. |
Real life uses :
Motion (or movement) is very important for persons as well as objects. Motion helps us the movement of life.
Places to visit :
Check a swimming pool near your place and see how a swimmer moves with respect to water.
Practical examples around us
| Examples | Explainations |
|---|---|
| Athletes competing in a race | When an athlete runs, he changes his position continuously with respect to others. So he is said to be in relative motion with respect to other athletes. |
What you learn in Theory:
What is relative velocity and its applications?
What you learn in Practice:
Day-to-day examples of relative motion.