Motion and Measurement of Distances
1. Give two examples each, of modes of transport used on land, water and air.
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2. Fill in the blanks:
(i) One metre is ______________ cm.
(ii) Five kilometre is ______________ m.
(iii)Motion of a child on a swing is ______________.
(iv)Motion of the needle of a sewing machine is ______________.
(v) Motion of wheel of a bicycle is______________.
3. Why can a pace or a footstep not be used as a standard unit of length?
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4. Arrange the following lengths in their increasing magnitude:
1 metre, 1 centimetre, 1 kilometre,1 millimetre.
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5. The height of a person is 1.65 m. Express it into cm and mm.
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6. The distance between Radha's home and her school is 3250 m. Express this
distance into km.
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7. While measuring the length of a knitting needle, the reading of the scale at one
end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?
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8. Write the similarities and differences between the motion of a bicycle and a
ceiling fan that has been switched on.
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9. Why would you not like to use a measuring tape made of an elastic material like
rubber to measure distance? What would be some of the problems you would
meet in telling someone about a distance you measured with such a tape?
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10. Give two examples of periodic motion
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