10. MOTION AND MEASUREMENT OF DISTANCES Science class 6 in English Medium ncert book solutions Chapter Review

Chapter Review:

• Cycle, bus, car, bull cart, train, boat, ship, aeroplane and helicopter are the main means of transport. 
• Cycle, moterbike, car, bus and train are the means of the road transport.
• Helicopter, jet aircraft, aeroplane are the means of air transport.
• Boat, steamer, ship are the means of water transport.
• The fixed quantity of measurement is called unit. 
• The SI unit of length is a metre (m).
• The full form of SI unit is International System of unit. 
• The magnitude of measuring is expressed into two parts i.e (i) Numerical part (ii)  Unit part.
• The length of a foot, the width of a finger, and the distance of a step are the ancient ways of measuring length. 
• The modern ways of measuring length are milimetre, centimetre, metre and kilometre etc. 
• Milimetre, centimetre  and metre are used to measure the small distances while kilometre for long distances.
• 1 kilometre is equal to 1000 metres.
• 100 centimetres are equal to 1 metre.
• There are 10 milimetres in 1 centimetre.
• There should be used a thread for measuring the curve line then thread is measured by scale. 
• The changing in position of an object along with time is known as motion.
• There are following types of motions: rectilinear motion, circular
  motion, periodic motion and rotational motion etc. 
• When the objects move along a straight line. This type of motion is called rectilinear motion.
• When an object maintains a fixed distance from a fixed point during motion such a motion is known as circular motion. 
• When an object repeats its motion after a fixed time of interval such a motion is known as periodic motion. 
• When an object moves on its axis is called rotational motion.