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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 particle is moving such that its position coordinates (x,y) are (2m, 3m) at time t = 0, (6m, 7m) at time t = 2 sec and (13 m, 14m) at time t= 5 sec. Average velocity vector (vav) from t = 0 to t = 5 s is,

  • 1 fifth left parenthesis 13 space i with hat on top space plus space 14 space j with hat on top right parenthesis
  • 7 over 3 open parentheses i with rightwards arrow on top space plus space j with hat on top close parentheses
  • 2 space left parenthesis straight i with hat on top space plus space straight j with hat on top right parenthesis
  • 11 over 5 open parentheses i with hat on top plus j with hat on top close parentheses

D.

11 over 5 open parentheses i with hat on top plus j with hat on top close parentheses

Average velocity vector,


straight v subscript av space equals space fraction numerator Net space displacement over denominator Time space taken end fraction

space space space space space space equals space fraction numerator left parenthesis 13 minus 2 right parenthesis straight i with hat on top space plus space left parenthesis 14 minus 3 right parenthesis straight j with hat on top over denominator 5 end fraction

space space space space space space equals space fraction numerator 11 space straight i with hat on top space plus space 11 space straight j with hat on top over denominator 5 end fraction

space space space space space space space equals space 11 over 5 open parentheses straight i with hat on top space plus space straight j with hat on top close parentheses

Average velocity vector,


straight v subscript av space equals space fraction numerator Net space displacement over denominator Time space taken end fraction

space space space space space space equals space fraction numerator left parenthesis 13 minus 2 right parenthesis straight i with hat on top space plus space left parenthesis 14 minus 3 right parenthesis straight j with hat on top over denominator 5 end fraction

space space space space space space equals space fraction numerator 11 space straight i with hat on top space plus space 11 space straight j with hat on top over denominator 5 end fraction

space space space space space space space equals space 11 over 5 open parentheses straight i with hat on top space plus space straight j with hat on top close parentheses

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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. 
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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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

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. 
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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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