Inverse Proportions
Chapter Name : Direct And Inverse Proportions |
Sub Topic Code : 104_08_13_03_01 |
Topic Name : Inverse Proportions |
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Sub Topic Name : Invers Proportions |
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Introduction
What is meant by Inverse proportion?
Pre-Requisites:
Basic knowledge about proportions
Activity:
The amount of force used to push the piston of the cycle pump is inversely proportional to the time taken to fill the tube.
Real Life Question:
How much time will it take ironman to reach stark tower if he increases his speed to Mach 2 from Washington?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Inverse Proportion | Two values are inversely proportional if the increase of one value decreases the other proportionally and vice versa. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Cycle pump | Take a cycle pump and ask the student to pump air with different speeds and observe the relation between the time taken to fill the tube and the speed of the piston. |
Real life uses :
Weighing instruments, Gas cylinders, petrol pumps, press, vehicles, air filling stations
Practical examples around us
| Examples | Explainations |
|---|---|
| Balance Air filling | In a physical balance, when a weight is placed in one tray, the other tray lifts up. The pressure of the air in a closed container is inversely proportional to the volume of the container. |
What you learn in Theory:
Two quantities are inversely proportional to each other if the change in one quantity changes the other quantity in the same manner.
What you learn in Practice:
When the piston of the cycle pump is pushed down slowly, The time taken to fill the tube is more. When the piston of the cycle pump is pushed down fast, the time taken to fill the tube is less.