Physics

• Physics


  The branch of science concerned with the nature and properties of matter and energy
• Fathers of Modern Physics

  • Newton
  • Galileo
  • Einstein
• Law of Inertia


  The tendency to do nothing or to remain unchanged unless the state is changed by an external force
• Quantity


  A property that is measured
• Quality


  Standard of something
• Types of quantity


  • Scalar
  • Vector
• Scalar


  Has magnitude (size) only
• Vector


  Has both magnitude (size) and direction
• SI unit


  International standard unit
• Second (s)


  Unit of time
• Law of acceleration


  Force of an object is equal to its mass times its acceleration
• Momentum


  Quantity of motion of a moving body, measured as a product of mass and velocity
• For every action there is an equal and opposite reaction
• Scalar quantities


  • time (s)
  • speed (m/s)
  • power (watt)
  • distance (m)
  • mass (kg)
  • work (Joule)
  • length (m)
  • temp (°C, °F)
  • area (m²)
  • volume (m³)
  • energy (Joule)
  • density (kg/m³)
• Vector quantities


  • displacement (m)
  • weight (kg)
  • Force
  • acceleration (m/s²)
  • impulse (N·s)
  • drag (N)
  • momentum (kg·m/s)
  • pressure (pascal, Pa)
  • gravity (N/kg)
• Distance (m), displacement (m), length (m), volume (m³) are scalar quantities
• Speed, velocity (m/s), acceleration (m/s²) are vector quantities