Motion

• Motion

  an act or process of changing place or position (movement). an instance of moving the body or its parts
• Linear motion

  Movement in a straight line
• Rotational motion

  Movement around a fixed axis
• Oscillatory motion

  Back-and-forth movement
• Random motion

  Unpredictable movement
• Distance

  • The total path traveled
  • Scalar quantity
• Displacement

  • the shortest path between start and end points
  • A vector quantity
• Speed

  • How fast an object moves
  • Indicates only a distance and time, no direction
• Velocity

  Speed wind direction
• Acceleration

  The rate of change of velocity over time
• Aristotle

  • based his ideas of motion on observation and logic, rather than experimentation
  • natural Motion (objects move toward their natural place) and violent motion (requires an external force)
  • Objects naturally come the rest, unless a force keeps them moving
  • Heavier objects fall faster than lighter ones
  • Motion in the absence of force is impossible
• Galileo Galilei

  • challenged Aristotle by using experimentation and mathematics
  • Inertia, acceleration due to gravity, friction and resistance, mathematical approach