Transcript FRAME OF REFERENCE

Distance and Displacement
(11.1 328-331)
FRAME OF REFERENCE
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A frame of reference is a system of objects that
are not moving with respect to one another.
To describe motion accurately and
completely, a frame of reference is
necessary.
Refer to butterfly and flowers example on
page 328 in the book.
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How fast you are moving is relative to
which frame of reference you choose to
measure your motion.
Relative Motion: movement in relation to
frame of reference
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Are you moving too?
 In a car: Do you look at the trees,
the ground or the seat in front of
you?
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Each has a different frame of
reference
DISTANCE
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Length of the path between two points
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The distance to school is 4 blocks + 3 blocks
+ 4 blocks = 11 blocks
Measure in Meters (m) & Kilometers (km)
1 km = 1000 m
 100 cm = 1 m
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DISPLACEMENT
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The direction from the starting point
and the length of a straight line from
the starting to end point.
 It doesn’t matter what the path
was…just the final result
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Distance and displacement
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Changing
direction
Vector has a magnitude AND direction
Arrows are used to show direction of a
vector
ADD displacements using vector addition
Displacement along a
straight line:
Vector Addition See fig. on pg 330
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 Resultant vector - the vector sum of
two or more vectors.
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Displacement that isn’t along
a straight path
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See figure on page 331
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