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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 drunkard walking in a narrow lane takes 5 steps forward and 3 steps backward, followed again by 5 steps forward and 3 steps backward, and so on. Each step is 1 m long and requires 1 s. Plot the x-t graph of his motion. Determine graphically and otherwise how long the drunkard takes to fall in a pit 13 m away from the start.

Distance space covered space in space 1 space step space equals space 1 space straight m space

Time space taken space equals space 1 space sec space

Time space taken space to space move space first space 5 space straight m space forward space equals space 5 space straight s space

Time space taken space to space move space 3 space straight m space backwards space equals space 3 space sec

Net space distance space covered space equals space 5 space minus space 3 space equals space 2 space straight m space

Net space time space taken space to space cover space 2 space straight m space equals space 8 space sec

Therefore comma space

Drunkard space covers space 2 space straight m space in space 8 space straight s comma space 4 straight m space in space 16 space sec comma
space 6 space straight m space in space 24 space sec space and space 8 space straight m space in space 32 space sec. space

That space is comma space the space drunkard space will space cover space straight a space distance space
of space 5 straight m space in space space the space next space 5 space sec. space

straight A space total space distance space of space 13 space straight m space is space covered space and space
he space falls space into space the space pit. space

Therefore comma

Net space time space taken space by space the space drunkard space to space
cover space 13 space straight m space equals space 32 plus 5 space equals space 37 space sec
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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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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. 
1215 Views

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. 
746 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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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