Top Formulas & Quick Revision- class 8

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Top Formulas & Quick Revision: Force and Pressure

Top Formulas & Quick Revision: Force and Pressure

🔹 Fundamental Formulas

1. Force (F):
Force = Mass × Acceleration
F = m × a
Unit: newton (N)
2. Pressure (P):
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)
4. Pressure in a Liquid:
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

🔹 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.

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