ELEMENTARY IDEA ABOUT DISTANCE AND DISPLACEMENT
[Essential points on 'distance' and 'displacement' is discussed here. It will be very helpful for 10 and 10+2 level students.]
DISTANCE
The Total path length traversed by a body of its initial position and final position is known as distance.
1)Distance is a scalar quantity.
2)Unit of distance
CGS Unit:-cm(Centimeter)
SI Unit:-m(Meter)
3)Dimension:-[M0LT0 ]
. DISPLACEMENT
The change of position of a particle with respect to a reference point is known as displacement .
The linear distance between the initial and final position of the particle is the measure of displacement .
It is a vector quantity.
Unit of displacement:-i)CGS UNIT: -cm.(centimeter.)
ii)SI UNIT:- m.(meter).
Dimension of displacement - [M0LT0 ]
Difference between Distance and displacement
|
Distance |
displacement |
1 |
It is the total path length travelled by an object |
It is the shortest distance between initial position and final
position of an object |
2 |
It is a scalar quantity |
It is a vector quantity |
3 |
It will be always positive or zero can never be negative |
It can be positive negative
and zero |
4 |
Distance > or = displacement |
Distance <or =displacement |
Frequently asked question:
1)Can distance be negative?
Ans:- NO, distance can not be negative.
2)Can distance be Zero?
Ans:- No, for a moving body distance can not be zero.
5)what is vector quantity?
Ans:-The quantity which possess both magnitude and direction is called a vector quantity .
6)Can displacement be negative?
Ans:- Yes, displacement can be negative.
7)Can displacement be Zero?
Ans:- Yes, for a body whose initial position and final position is same the displacement will be zero.
8)Can displacement decrease with time?
Ans:-yes, for a moving body displacement can decrease with time.
9) When displacement and distance have the same value?
Ans :- If the particle moves in a straight line then both the displacement and distance will be the same.
If the body moves following a curved path then distance will be greater than displacement.
Numerical problems
fig -1
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