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Motion in Straight Line
Question
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State, with reasons, which of the following graphs cannot possibly represent one dimensional motion of particle: 

Answer

One-dimensional motion of the particle is represented by graphs (b) and (d).
But, (a), (c), (e) and (f) cannot represent the motion of particle because, 

(a) a particle cannot have two velocities at the same time,

(c) a particle cannot have two positions simultaneously at the same time,

(e) total length of path can never decrease with time and

(f) a particle cannot have two different accelerations at the same time.

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Some More Questions From Motion in Straight Line Chapter

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

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.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?