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Anti-derivative of Physical Quantity
  Linear Motion
   Example of Linear motion

Anti-derivative of Physical Quantity

In practical application, the interpretation of an indefinite integral as the anti-derivative of a function provides a mean for determining the physical qunatity when the physical quantity can be quantified in the form of infinitesimal elements.

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Anti-differentiation can also be applied to higher derivative. Through successive integration, related physical quantity functions can be determined.

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In order to determine the integration of constants, extra information, such as initial conditions, or boundary conditions are needed.

Linear Motion

The four variables to describe linear motion are acceleration a, velocity v, displacement s, and time t. Imply

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From the definition of acceleration, uniform acceleration is defined as the average velocity of an object over a period of time. imply

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From the definition of velocity, uniform velocity is defined as the average displacement of an object over a period of time. imply

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But for velocity with acceleration or deceleration, variable velocity is also a function of time. imply

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Example of Linear motion

A bullet is fired to a fixed board of thickness 5. The entering speed, vo is 10 and the leaving speed, v is 2. If the deceleration, a of the bullet is a constant, how much time, t is required to pass through the board and what it the thickness of the board required to stop the bullet from coming out.

Determine the acceleration first.

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Since the velocity is decelerating, the velocity is a function of time, the time required is

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To determine the required thickness of the board to stop the bullet, determine the accelaration first, imply

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Using the same board to stop the bullet, imply v=0, and accelerarion is the same imply

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The required thickness is

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ID: 120100013 Last Updated: 1/11/2012 Revision: 0 Ref:

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References

  1. S. James, 1999, Calculus
  2. B. Joseph, 1978, University Mathematics: A Textbook for Students of Science & Engineering
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