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Motion in Straight Line

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Physics Part I

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Figure 3.24 gives the x-t plot of a particle in one-dimensional motion. Three different equal intervals of time are shown. In which interval is the average speed greatest, and in which is it the least? Give the sign of average velocity for each interval.

The average speed of a particle shown in the x-t graph is obtained from the slope of the graph in a particular interval of time.

It is clear from the graph that the slope is maximum and minimum restively in intervals 3 and 2 respectively. Therefore, the average speed is greatest in interval 3 and least in interval 2. 

For intervals 1 and 2, average velocity is positive as the slope is positive. For interval 3 slope is negative therefore, the average velocity is negative. 


What is the most essential thing to study the motion of a body?

The most essential thing to study the motion is reference frame. Rest and motion are relative terms. It means that an object in one situation can be in rest but in another situation, the same object will be in motion. 

Can a body be always at rest in some frame?

Yes, a body is always at rest in a frame which is fixed with the body itself. 

What is motion?

When an object changes it's position with time, with respect to it's surroundings, the object is said to be in motion. 

Is absolute rest or absolute motion possible?

Absolute rest and absolute motion is not possible because there is no point in the universe which is at rest and can be taken as point of reference. The planet Earth is in continuous motion. 

What is rest?

When an object does not change its position with time, with respect to it's surroundings. In such a case the object is said to be at rest.