Chapter-10 Motion and measurement of distance - Class 6

Keywords :

1. Circular Motion 

Explanation:

 When a body moving on a circular path with uniform speed, this motion is called "Circular Motion"

For example :- Motion of earth around the sun.


2. Distance :

Explanation: 

The length of the actual path covered by an object is called the "Distance".


3. Measurement : 

Explanation:

The comparison of unknown quantity with some known quantity is known as, "Measurement".


4.Motion : 

Explanation:

When a body changes it's position with respect to time is called "Motion".


5. Periodic Table :

Explanation:

 The periodic table is an arrangement of the chemical elements ordered by atomic number is called as, "Periodic Table".


6. Rectilinear Motion : 

Explanation:

Motion of an object alone a straight line is called as, "Rectlinear Motion". 


7. S.I Units :

Explanation:

 For the sake uniformity scientists all over the world have accepted a set of standard units of measurement. The system units now used is known as the international system of units.


8. Units of Measurements :

Explanation:

A Unit is an internationally accepted standard for measurements of quantities.


Exercise Questions :10. Give two examples of periodic motion.

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

Explanation : 

(i) Land Transport :- Train & Bus

(ii) Water Transport :- Ship & Boat

(iii) Air Transport :- Helicopter & Aeroplane


10. 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______________.

Explanation :

(i) 100 cm

(ii) 5000 m

(iii) Periodic

(iv) Periodic

(v) Circular


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

Explanation :

The standard unit of length is a fixed length all over the world, which does not vary with time, place and persons and is not affected by any natural phenomenon.


12. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

Explanation : 

1 millimetre, 1 centimetre, 1 metre, 1 kilometre


13. The height of a person is 1.65 m. Express it into cm and mm.

Explanation: 

1.65= 165 cm = 1650 mm

14. 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?

Explanation :

 Length of needle = 33.1 cm - 3.0 cm = 30.1 cm


15. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on ?

Explanation :            

               Similarities:-

(i) Wheel of bicycle and ceilling fan both shows circular motion.

                                       Differences :-

(ii) Cycle moves in Rectilinear motion but ceiling fan does not move in rectlinear motion.


16. 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?

Explanation :-

Elastic tape will not give accurate measurement because it stretches in length and reduces in size when not stretched. While telling the measurement taken with an elastic tape. We have to tell whether the tape was stretched and by how much , this becomes very difficult.


17. Give two examples of periodic motion ?

Explanation : 

(i) Pendulum

(ii) Child on the swing