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Asked/Added Questions From NCERT:


Answer:

Aman Senapati

 Sol.) The total distance covered by Shyam

                                                        =AB+BC+CD+DE+EF

                                                        =(1+2+1+2+2)Km = 8 Km

        The magnitude of displacement of Shyam

                                                          = AF = 5 Km

        The magnitude of displacement is less than the distance covered by him.

-Answered by Aman Senapati On 31 May 2020:10:02:26 AM


Question 2. Asked on :31 May 2020:09:30:54 AM

 Give a short note on displacement?

-Added by Aman Senapati Physics » Motion

Answer:

Aman Senapati

  1. Displacement during a given time is the shortest distance measured from initial position of the object.
  2. Displacement is characterised by its magnitude as well as direction. Thus,displacement is a vector.
  3. Displacement can be positive or negative or even zero.

-Answered by Aman Senapati On 31 May 2020:09:40:08 AM


Question 3. Asked on :31 May 2020:09:26:44 AM

Give a short note on distance?

-Added by Aman Senapati Physics » Motion

Answer:

Aman Senapati

  1. Distance is the total path length covered by an object during a given time.
  2. Distance has a magnitude only and no direction.Thus,distance is a scalar.
  3. Distance is always taken positive. 

-Answered by Aman Senapati On 31 May 2020:09:44:50 AM


Question 4. Asked on :31 May 2020:09:23:01 AM

 Define rest?

-Added by Aman Senapati Physics » Motion

Answer:

Aman Senapati

 Objects,which are stationary and do not change their positions with time are, said to be at rest.

-Answered by Aman Senapati On 31 May 2020:09:24:55 AM


Question 5. Asked on :31 May 2020:09:22:12 AM

Define motion?

-Added by Aman Senapati Physics » Motion

Answer:

Aman Senapati

 An object is said to be in motion when its position changes with time.

-Answered by Aman Senapati On 31 May 2020:09:23:53 AM


Question 6. Asked on :28 September 2019:07:49:50 AM

What is displacement?

-Added by Himanshi Verma Science » Motion

Answer:

priyanshu kumar
It is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude. It is represented as an arrow that points from the starting position to the final position. For Example- If an object moves from A position to B, then the object’s position changes. This change in position of an object is known as Displacement.

-Answered by priyanshu kumar On 30 September 2019:11:30:17 AM


Answer:

Master Purushottam

  (a) Not true, because if the initial and final position of the object is the same displacement can become zero.

 
(b) Not true, because, displacement is the shortest measurable distance between the initial and final positions of an object. It cannot be greater than the magnitude of the distance travelled by an object, but it can be smaller than the magnitude of the distance travelled by an object or , it may be equal to the distance travelled by the object.

-Answered by Master Purushottam On 24 August 2019:12:11:30 AM


Question 8. Asked on :15 January 2019:06:04:35 PM

 A man walks around a square street of side 10 m in 40 sec. Calculate the displacement of the man at the end of 2 minutes 20 seconds.

-Added by Himanshi Verma Science » Motion

Answer:

Master Purushottam

 The man takes 40 sec to cover ( 4 * 10 ) 40 metres. This shows he covers one metre in one sec.

In 2 min 20 sec (140 sec) , he will cover a distance of  140 metres.

Thus he completes  14040 = 3.5 rounds in 2 min 20 sec.

Hence it is noticed that he will be at the opposite side from where he started.

Now considering two simple cases.

Case (i)

If the man started at a corner of the square street:

In this case, the man would be diagonally opposite to the place from where he started

Displacement = diagonal of square with side 10 metre.

=   102+102

=   100

=14.1m

Case (ii)

The man started from the middle of the road.

After the end time, he is in the opposite side of the road.

Hence, the displacement is 10 metre.

-Answered by Master Purushottam On 24 August 2019:12:11:55 AM


Question 9. Asked on :07 January 2019:12:54:06 AM

 What is retardation?

-Added by ATP Admin Science » Motion

Answer:

Nishant Verma

    Negative acceleration is called retardation.


-Answered by Nishant Verma On 17 October 2019:02:39:46 PM


 

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