Pressure in Fluids and Atmospheric Pressure — Flashcards
ICSE · Class 9 · Physics
35 flashcards for Pressure in Fluids and Atmospheric Pressure (ICSE Class 9 Physics) to test yourself on key terms and facts.
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State the definition of thrust and pressure.
Answer
Thrust is the force acting normally on a surface. Pressure is the thrust per unit area of surface. Formula: P = F/A. Units: thrust in newton, pressure in pascal.
A force of 20 N acts normally on an area of 4 m². Find the pressure.
Answer
Given: F = 20 N, A = 4 m². Formula: P = F/A. Step 1: P = 20/4 N m⁻². Step 2: P = 5 N m⁻². Answer: 5 Pa.
A thrust of 600 N acts on an area of 0.5 m². Find the pressure.
Answer
Given: F = 600 N, A = 0.5 m². Formula: P = F/A. Step 1: P = 600/0.5 N m⁻². Step 2: P = 1200 N m⁻². Answer: 1200 Pa.
Why does a sharp knife cut better than a blunt knife?
Answer
A sharp knife has a smaller area of contact. For the same thrust, smaller area gives greater pressure. Greater pressure helps cutting more easily. A pointed pin works on the same principle.
A brick exerts a thrust of 4 kgf on the ground. Its base area is 50 cm². Find the pressure.
Answer
Given: Thrust = 4 kgf, Area = 50 cm². Formula: Pressure = Thrust/Area. Step 1: P = 4/50 kgf cm⁻². Step 2: P = 0.08 kgf cm⁻². Answer: 0.08 kgf cm⁻².
A brick exerts a thrust of 4 kgf on the ground. Its base area is 200 cm². Find the pressure.
Answer
Given: Thrust = 4 kgf, Area = 200 cm². Formula: Pressure = Thrust/Area. Step 1: P = 4/200 kgf cm⁻². Step 2: P = 0.02 kgf cm⁻². Answer: 0.02 kgf cm⁻².
State the S.I. unit of pressure and define one pascal.
Answer
The S.I. unit of pressure is pascal, symbol Pa. One pascal is the pressure exerted on a surface of area 1 m² by a force of 1 N acting normally on it. So, 1 Pa = 1 N m⁻².
Convert 1 dyne cm⁻² into N m⁻².
Answer
Conversion: 1 dyne cm⁻² = 0.1 N m⁻². Answer: 0.1 N m⁻².
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