Q1
What is the formula for pressure?
AForce ÷ Area
BForce × Area
CForce + Area
DForce - Area
ICSEClass 8 (ICSE)ScienceCh 3 · Topic 1
Force and Pressure
Force is a push or pull, and pressure is force applied over an area, both important concepts in explaining how objects interact and move.
Core concept
Pressure is calculated as Force ÷ Area, meaning the same force spread over a smaller area creates more pressure.
How it works
This explains why a sharp knife cuts easily (small area, high pressure) while a blunt one doesn't (larger area, lower pressure).
Why it matters
Atmospheric pressure is the force exerted by air on objects, decreasing as altitude increases (thinner air at higher elevations).
Key detail
Understanding force and pressure helps explain everyday phenomena, like why snowshoes prevent sinking or why straws work for drinking.
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Quick notes
• Pressure = Force ÷ Area.
• Same force over smaller area means more pressure.
• Sharp knives have small area, high pressure.
• Blunt knives have larger area, lower pressure.
• Atmospheric pressure is air's force on objects.
• It decreases with altitude.
• Snowshoes spread weight over larger area.
• This explains many everyday phenomena.