Pressure
Chapter Name : Force And Pressure |
Sub Topic Code : 101_08_11_08_01 |
Topic Name : Pressure |
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Sub Topic Name : Pressure |
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Introduction
What is pressure?
Pre-Requisites:
Introduction to Forces
Activity:
Observe that when you walk on sand, your feet sinks. But when you lie on sand, your body does not sink. Why do you think this is?
Real Life Question:
Why is it easier to cut from a sharp knife than a blunt one?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Pressure | Force divided by the area on which it is applied |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Nail & Hammer | Demonstration [Caution] |
Real life uses :
Local Science Museum – Pressure Exhibit
Places to visit :
Local Science Museum – Pressure Exhibit
Practical examples around us
| Examples | Explainations |
|---|---|
| Porter | A porter ties a cloth on his head, there by increasing the area and reducing the pressure |
| Its easier to cut with a sharp knife than a blunt one | In case of a blunt knife, the thin area that does the cutting is larger when compared to a sharper one. Thus, lower the area, lesser is the force required to obtain same pressure. |
What you learn in Theory:
Definition of Pressure and how it depends on area over which the force is applied
What you learn in Practice:
The means by which force can be increased or decreased, by varying the area or vice versa to obtain the same/ required pressure.