While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

5

(a)

How are the motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan different? Explain.

5

(a)

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for difference in their measurements? (Mention any three)

5

(a)

It is not accurate to measure a length with elastic tapes. Explain why.

5

(a)

Boojho was riding in his bicycle along a straight road. He classified the motion of various parts of the bicycle as (a) rectilinear motion (b) circular motion and (c) both rectilinear as well as circular motion. Can you list one part of the bicycle for each type of motion? Support your answer with reason.

5

(a)

How can we find the length of a curved line? Explain.

5

(a)