Top Formulas & Quick Revision: Force and Pressure
🔹 Fundamental Formulas
1. Force (F):
Force = Mass × Acceleration
F = m × a
Unit: newton (N)
Force = Mass × Acceleration
F = m × a
Unit: newton (N)
2. Pressure (P):
Pressure = Force / Area
P = F / A
Unit: pascal (Pa) = N/m2
Pressure = Force / Area
P = F / A
Unit: pascal (Pa) = N/m2
3. Gravitational Force:
Weight = Mass × Acceleration due to gravity
W = m × g
g = 9.8 m/s2 (on Earth)
Weight = Mass × Acceleration due to gravity
W = m × g
g = 9.8 m/s2 (on Earth)
4. Pressure in a Liquid:
Pressure = h × ρ × g
P = h × ρ × g
h = depth, ρ = density of liquid, g = acceleration due to gravity
Pressure = h × ρ × g
P = h × ρ × g
h = depth, ρ = density of liquid, g = acceleration due to gravity
5. Atmospheric Pressure:
Standard atmospheric pressure at sea level = 1.013 × 105 Pa
Standard atmospheric pressure at sea level = 1.013 × 105 Pa
🔹 SI Units Quick Recap
- Force: newton (N)
- Pressure: pascal (Pa)
- Area: m2
- Mass: kg
- Acceleration: m/s2
- Density: kg/m3
- Height (depth): m
🔹 Important Notes
✔ A sharp knife cuts better because pressure increases as area decreases.
✔ Camels have broad feet to reduce pressure on sand.
✔ Force has both magnitude and direction – it's a vector quantity.
✔ Pressure is a scalar quantity – it only has magnitude.
