Motion and measurement of distances

• Different modes of transport are used to go from one place to another
• In ancient times, people used the length of a foot, the width of a finger, and the distance of a step as units of measurement, leading to confusion and the need for a uniform system of measurement
• The International System of Units (SI unit) is now accepted worldwide, with the meter as the unit of length
• Rectilinear motion is motion in a straight line
• Circular motion is when an object moves in a way that its distance from a fixed point remains the same
• Periodic motion is motion that repeats itself after some period of time
• Measurement involves comparing an unknown quantity with a known quantity of the same kind, consisting of the unit of measurement and the number of units the object measures
• Conventional methods of measurement, like handspan, cubit, arm length, and footstep, have been approximate and lack precision
• Standard units of measurement, such as meter for length, kilogram for mass, and second for time, provide a uniform way to measure quantities
• Motion is when the position of a body changes over time, with rest indicating no change in position and motion indicating a change in position
• Types of motion:

  • Linear motion
  • Linear motion is further classified into two
• Types of motion:

  • Rectilinear Motion: Object moves from one position to another along a straight line. Example: group of ants moving in a line
  • Curvilinear Motion: Object moving along a curved line. Example: a car moving along a curved road
  • Random Motion: Object moves from one position to another and changes direction in an irregular manner. Example: butterfly, flies randomly in a garden
  • Circular Motion: Object moves in a circular manner in relation to its own axis or around a fixed center. Two types:
  • Revolution: Object moves as a whole around a fixed center. Example: earth revolving around the sun in a definite orbit
  • Rotation: Object moves in a circular path in relation to its own fixed axis. Example: blades of a moving fan, windmill, etc
  • Vibratory Motion: Object moves to and fro very fast. Example: strings of a guitar when plucked
• • Periodic Motion: Object oscillates to and fro along the same path again and again with the same speed. Example: heartbeat, pendulum of a clock
  • Non-periodic Motion: Object does not repeat motion at regular intervals of time
  • Uniform Motion: Body covers equal distance in equal time intervals
  • Non-uniform Motion: Body covers unequal distance in equal intervals of time