Class 9 Physics
Motion
- Speed: distance / time
- Velocity: displacement / time
- Acceleration: (v - u) / t
- First equation: v = u + at
- Second equation: s = ut + (1/2)at^2
- Third equation: v^2 = u^2 + 2as
Force, Gravitation, Work and Energy
- Force: F = ma
- Momentum: p = mv
- Weight: W = mg
- Pressure: P = Force / Area
- Density: mass / volume
- Work: W = F x s
- Kinetic energy: KE = (1/2)mv^2
- Potential energy: PE = mgh
- Power: Work / Time
Class 9 Chemistry
Matter, Atoms and Molecules
- Density: mass / volume
- Temperature: K = deg C + 273
- Molecular mass: Sum of atomic masses
- Mole: 1 mole = 6.022 x 10^23 particles
Structure of Atom
- Atomic number: number of protons
- Mass number: protons + neutrons
Class 9 Biology
Cells and Health
- Magnification: image size / object size
- BMI: weight(kg) / height(m)^2
Tissues and Resources
- Tissue: group of similar cells performing a specific function
- Population density: population / area