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Motion in Straight Line

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1 on a straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and returns home by an auto with a speed of 25 km h–1. Choose suitable scales and plot the x-t graph of her motion.

Speed space of space the space woman space equals space 5 space km divided by hr

Distance space between space her space office space and space home space equals space 2.5 space km space

Time space taken space equals space fraction numerator Distance space over denominator Speed end fraction equals fraction numerator 2.5 over denominator 5 end fraction space equals space 0.5 space straight h space equals space 30 space min space

Given space that space the space woman space covers space the space same space distance space in space the space evening. space

Speed space of space the space auto space equals space 25 space km divided by hr

Time space taken space equals Distance over Speed equals fraction numerator 2.5 over denominator 25 end fraction equals 1 over 10 equals 0.1 space straight h space equals space 6 space min

Distance minus time space graph space for space the space motion space of space woman space is space shown space below. space
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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. 
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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. 
1986 Views

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. 
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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. 
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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. 
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