Chapter 10 **Motion and Measurement of Distances**

NCERT Solutions for Class 6 Science Chapter 10 **Motion and Measurement of Distances**

**Q. – Give two examples each, of modes of transport used on land, water and air?**

Answer:-

Cars and Buses are the two modes of land transportation.

Cruise and boats are two types of water transportation.

Helicopters and aeroplanes are two types of air transport.

**Q. – 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______________.

Answer:-

- 100 cm
- 5000 m
- Periodic motion
- Periodic motion
- Circular motion

**Q. – Why can a pace or a footstep not be used as a standard unit of length?**

Answer:-

The length of a pace or a footstep differs from one person to another. If we use the pace/footstep as the standard unit to calculate length, then two measured quantities will not be the same. That’t why we cannot use pace/footstep as a standard unit of length.

**Q. – Arrange the following lengths in their increasing magnitude:**

**1 metre, 1 centimetre, 1 kilometre,1 millimetre.**

Answer:-

1 millimetre > 1 centimetre > 1 metre > 1 kilometre

**Q. – The height of a person is 1.65 m. Express it into cm and mm.**

Answer:-

We know that 1 m = 100 cm ,so 1.65 m = 1.65 *100 = 165 cm

We know that 1 cm = 10 mm

So 1.65 m = 1.65 * 100 * 10 = 1650 mm

**Q. -The distance between Radha’s home and her school is 3250 m. Express this distance into km.**

Answer:-

We know that 1km = 1000 m

3250 m = 3250/1000 km = 3.25 km

**Q. – 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?**

Answer:-

The length of the needle begins at 3.0 cm

So the needle’s actual length is (33.1 – 3.0) cm = 30.1 cm.

**Q. – Give two examples of periodic motion.**

Answer:-

Two examples of periodic motion are pendulum clock motion and swing motion.

**Motion and Measurement of distances notes Extra Question Answers **

**Q. -What is cubit?**

Answer:-

A cubit as the length from the elbow to the fingertips was used in ancient Egypt.

**Q. – When a metric system is created and who made it?**

Answer:-

The metric system was developed by the French in 1790 as a standard unit of measurement.

**Define:-**

**Rectilinear motion?**

Answer:-

When an object moves in a straight line. This is referred to as rectilinear motion.

**Periodic motion?**

Answer:-

When an object’s motion is repeated after a period of time. This is referred to as periodic motion.

**What are the things we used to measure in ancient time?**

Answer:-

People used the length of a foot, the width of a finger, and the distance of a step as units of measurement in ancient times.

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