NCERT Solutions for Class 6th Science
Chapter 10. MOTION AND MEASUREMENT OF DISTANCES
- 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.