Frame of reference

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Frame of reference

• space and time

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Position

• An objects location
• (x)

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Motion

• The act of changing position
• (even if it wasnt observed)

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Displacement

• Change of position

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There are two ways to think about motion
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A. How large was the change of position?
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B. How large and in what direction was the
change of position?
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Distance

• The magnitude of the change of position

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Absolute value

• Place the factor between vertical lines.

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Absolute value

• l - 400 cm l 400 cm

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Initial position

• (xi)

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Final Position

• (xf)

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Change of position

• ? (delta)

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Change of position or displacement

• l ? x l

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The equation for displacement

• ? x xf - xi

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The equation for distance reads

• d l? xl lxf - xil

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For our purpose, distance will always be

• d xf - xi