Direct Proportions
Chapter Name : Direct And Inverse Proportions |
Sub Topic Code : 104_08_13_02_01 |
Topic Name : Direct Proportions |
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Sub Topic Name : Direct Proportions |
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Introduction
What is meant by direct proportion?
Pre-Requisites:
Basic knowledge about proportions
Activity:
The amount of force used to push the piston of the cycle pump is directly proportional to the speed of the air coming out.
Real Life Question:
How much time will it take for 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) |
|---|---|
| Direct Proportion | If The ratio of two quantities remain in the same proportion, then they are directly proportional. |
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 speed with which the air comes out 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 |
|---|---|
| Spring Balance Air filling | In a spring balance, the length of the extension of spring is directly proportional to the weight of the object. The pressure of the air filled into a tube is directly proportional to the force with which the air is being filled. |
What you learn in Theory:
Two quantities are directly 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 air coming out comes slowly. When the piston of the cycle pump is pushed down fast, the air coming out also comes fast.