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GENERAL SCIENCE, CLASS: 6th, , Chapter: Motion and measurement of distances, , I. Answer the following questions., 1. What is transportation?, Ans: Transportation is the movement of humans, animals and goats from one, place to another place., 2. Mention some of the local units to measure length and breadth., Ans: Handspan, Angul( finger),cubit, mutthi (fist) etc. are some of the local units, used to measure length and breadth., 3. What is metric system?, Ans: The standard unit of measurement which is used in the world uniformly is, called metric system. It was introduced by French, 4. What are the different steps to be taken care for the measurement of a length., Ans: The following are the different steps to be taken care for the measurement of, length, • Place the scale in contact with object along its length., • Measurement should be started from zero. If zero mark is worn out then can, use any other full mark of the scale., • Correct position of the eye is also important for taking measurement., 5. What is motion?, Ans: The change in the position of an object over time is called motion., 6. What are the different types of motion?, Ans: The different types of motion are, • Linear motion, • Circular motion, • Periodic motion, 7. What is linear motion? Give example, Ans: The movement of an object in a straight line is called linear motion., Ex:, • Moving car on straight road, • March past of students, , 8. What is circular motion? Give example
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Ans: The movement of an object in a circular path is called circular motion., Ex: Moving fan, 9. What is periodic motion? Give examples, Ans: The motion of an object which is repeated in equal intervals of time is called, periodic motion., Ex: pendulum, 10. Mention the two kinds of Motion that the Earth possess., The two kinds of motion that the Earth possess are rotation and revolution., 11. Give some examples for circular motion., Motion of the Moon around the Earth., Running of an athlete on a circular track, Motion of hands of a clock, A child sitting in a rotating merry go round., 12. Give some examples for periodic motion., • To and fro motion of a child on a swing., • Oscillation of a pendulum., • A rocking chair, • Vibration of a tuning fork, 13. Identify the types of motion observed in the following examples., (i) movement of a bullet fired from a gun – Rectilinear motion, (ii) motion of satellites around the Earth – Circular motion, (iii) motion of a cyclist – Curvilinear motion, (iv) movement of the strings of a guitar – Periodic motion, (v) Spinning of the Earth on its axis – Rotational motion, (vi) motion of a pendulum clock – Periodic motion, (vii) Motion of a cyclist on a straight road – Rectilinear motion., 14. What is measurement?, Measurement is a comparison of an unknown quantity with a known fixed, quantity of the same kind., Note: The value obtained on measuring a quantity is called its magnitude., Magnitude of a quantity is expressed as numbers in its units., , 15. What is rotational motion ? Give examples
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Rotational Motion is defined as the motion of an object around a circular path, in, a fixed orbit., Ex: rotation of a ceiling fan. Movement of hands of a clock, 16. What is revolutionary motion ? Give examples, The motion of the object around a point along the circular path about a fixed axis, is called revolutionary motion., Ex: Earth revolving around sun, an Electron around nucleus.
