Determining Position “Hey, Is This Thing Moving?”.
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Transcript of Determining Position “Hey, Is This Thing Moving?”.
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Determining Position
“Hey, Is This Thing Moving?”
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Position Position is defined relative to a
reference point and reference directions.
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Reference Points and Reference Directions Three things must be included:1.) A reference point – a starting point
used to describe the position of an object.
2.) A reference direction that describes which way to move in relation to the reference object.
3.) A distance from the reference point.
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Reference Points and Reference Directions The flagpole can be used as a reference point for finding the bicycle. (Can you give directions to locate the bike?)
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Reference Points and Reference Directions A plus sign (+) indicates movement in
the direction of the reference point. A minus sign (–) indicates movement
in the direction opposite of the reference point.
The description of an object’s motion also depends on the reference point chosen.
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Position as a Vector A vector is a quantity in which two things
must be specified: Distance from the reference point
(represented by the length of the arrow)
Direction from the reference point (represented by the direction the arrow is pointing)
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Positions in Two Dimensions Objects that do not
move in straight lines require two reference directions.
A car traveling from San Diego to Sacramento doesn’t move in a straight line. (What direction would we say it is traveling?)
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Positions in Two Dimensions In this map of a city, the art museum is located ___________m west and ___________m south of the bus station.
1,000
250
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Changing Position The change in an object’s position is
called its displacement.
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Changing Position Displacement is the difference
between the initial position and the final position of an object.
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Changing Position Displacement includes a size and a
direction. Displacement is a vector.
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Changing Position Direction of displacement is the
direction from starting point to end point.
Size of displacement is the distance from the starting point to the ending point.
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Distance and Displacement
Distance __________Displacement __________
40 m40 m East
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Distance and Displacement
Distance __________Displacement ________________
70 m50 m Northeast
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Distance and Displacement
Distance __________Displacement _________
140 m0 m
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Displacement is a(n) ____ because it has both size and direction.
A speed
B velocity
C vector
D acceleration
1.1 Determining Position
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Position is defined relative to ____.
A a reference point and a vector
B displacement and reference directions
C a vector and reference directions
D a reference point and reference directions
1.1 Determining Position
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Which of the following statements is true?
A Displacement and distance traveled are always the same.
B Displacement and distance traveled are never the same.
C Distance traveled is the direction of the displacement vector.
D Displacement and distance traveled are the same if the direction does not change.
1.1 Determining Position
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What must you have to determine a position?
A acceleration
B velocity and speed
C reference point and origin
D reference point and reference direction
SCI 1.a
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