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Motion in Straight Line
Figure 3.21 shows the x-t plot of one-dimensional motion of a particle. Is it correct to say from the graph that the particle moves in a straight line for t < 0 and on a parabolic path for t >0 ? If not, suggest a suitable physical context for this graph.
Position-time graph represents the position of particle at any instant, not the trajectory of particle.
For t < 0, the position-time graph is time axis which signifies that the particle is at rest.
For t > 0, the position-time graph is a parabola which signifies that the body starts moving with constant acceleration.
The given graph is a suitable context for a body is dropped from a certain height at t=0.
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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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