# NCERT Class VI Science Solutions: Chapter10 – Motion and Measurement of Distance Part 5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 16:

Match the events related to motion in Column I with the types of motions given in Column II.

 Column I Column II A moving wheel of a sewing machine. Circular motion. Movement of tip of the minute hand of a clock in one hour. Rotational motion A moving swing. Periodic motion.

 Column I Column II A moving wheel of a sewing machine. ii. Rotational motion Movement of tip of the minute hand of a clock in one hour. i. Circular motion. A moving swing. iii. Periodic motion.

Question 17:

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.

When we see the trees from a moving train, their position is changing with respect to us. Hence they appear to be moving. On the other hand the position of co-passengers is not changing with respect to us, hence they appear to be stationary.

Question 18:

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

 Wheel of moving bicycle Mark on the blade of electric fan It execute rectilinear as well as circular motion because the wheel as a whole will move forward and its point or particles around the rim will execute circular motion. It execute circular motion because the mark on the blade of a fan will move such that its distance from the center of the fan will remain same. It change position while executing circular motion. It cannot change its position. It can cover some distance in any time interval. It cannot cover any distance. Wheel around its axle execute rotational motion. It cannot execute rotational motion.

Question 19:

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)

Hint: Some of the reasons for difference in their measurement could be:

• Different measuring devices were used.
• The smallest length that could be measured by different devices maybe different.
• Measurement may not be along the shortest length in all three cases.
• The end of the corridor may not be easily accessible.
• The measuring devices may be faulty (not standardized)
• Any other correct reason.

(Any three can be considered)

Question 20:

Boojho was riding in his bicycle along a straight road. He classified the motion of various parts of the bicycle as (I) Rectilinear motion. (II) Circular motion and (III) 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.