Motion in Straight Line
Displacement and distance can be compared as follows:
(i) Both have units and dimensions same as that of length.
(ii) The change in position of particle in particular direction is known as displacement while distance is the total length of path travelled by particle.
(iii) Displacement is a vector quantity while distance is a scalar quantity.
(iv) Displacement can be negative, positive or zero while distance covered by particle is always positive.
(v) Displacement of a particle between two points is a unique path, while distance is not a unique path .
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State which of the following are examples of one, two or three dimensional motion:
(a) A kite flying in the sky.
(b) The earth revolving around the sun.
(c) A train moving along the equator of the earth in clockwise direction.
(d) Accelerated motion of a particle in a straight line.
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