Moving things around us

  • When we look around, we find that some objects are at rest and some are moving or in motion.
  • The motion of all the objects are not of the same type.
  • Some objects may have more than one type of motion at the same time.

Motion: It is a state of objects in which they are moving, that is, they are changing their place with the changing time.

  • Curved lengths cannot be measured using metre scales.
  • A string or a thread can be used to measure curved lines by creating a knot at one end and keeping that at the beginning, one can trace the curved line.
  • Then this length can be stretched out and measured with the help of a metre scale.
  • A measuring tape can be used to find the lengths of curved objects. E.g. girth of a tree trunk, or length of a snake.
  • Rest: All the stationary objects which are not in motion, that is, do not change their place with time are said to be at rest.
  • Objects which are moving around us are said to be in motion whereas the objects which are not moving are said to be at rest.
  • Any change in position with time can be termed as motion.
  • A motion can be termed slow or fast based on the distance it covers in a specific amount of time. More distance covered means the motion is fast and vice versa.
  • Motion can be the complete object or the parts within it.
  • Objects like trains, hands of a clock, ants are moving objects whereas houses, trees, wall clocks or non-moving or stationary objects.