Distance and Displacement in Physical Science
Distance and Displacement
Physical Science
Unit 2
Frame of Reference
•
To describe motion accurately and completely, a
frame of reference is necessary
•
frame of reference
is a system of objects that are
not moving with respect to one another.
•
Ex. A butterfly flying up and down in front of a
person
•
Relative motion
is movement in relation to a
frame of reference.
•
Ex. A car driving by someone standing on the
side of the road
Measuring Distance
•
Distance
is the length of a
path
between two
points.
(only numerical)
•
Distance from Madison to Flowood (not a
straight line)
•
The SI unit for measure distance is meter (m)
•
For larger measurements of distance the
kilometer (km) is used.
Measuring Displacement
•
To describe an object’s position relative to a
given point, you need to know how far away
and in what direction the object is from that
point.
•
Displacement
is the direction from the
starting point and the length of a straight line
from the starting point to ending point
(straight line distance).
•
Numerical value and a direction
Vectors
•
Displacement is an example of a vector
•
Vectors
are quantities that have
magnitude
and
direction.
•
The magnitude can be size, length, or amount
•
Vector addition is the combining of vector
magnitudes and directions
Displacement Along a Straight Line
•
When two displacements represented by two
vectors, have the same direction, you can add
their magnitudes.
Continued…..
•
When two displacements are in opposite
directions, the magnitudes subtract from each
other
Displacement Not Along a Straight
Path
Questions
1.
What is a frame of reference? How is it used to
measure motion?
2.
How are distance and displacement similar and
different?
3.
How are displacements combined?
4.
A girl who is watching a plane fly tells her friend that
the plane isn’t moving at all. Describe a frame of
reference in which the girl’s description would be
true.
5.
Is displacement more like the length of a rope that is
pulled tight or the length of a coiled rope? Explain
Questions
6.
Would you measure the height of a building
in meters? Explain your reasoning.
7.
Should your directions to a friend for
traveling from one city to another include
displacements or distances? Explain
8.
The resultant vector of two particular
displacement vectors does not equal the sum
of the magnitudes of the individual vectors.
Describe the directions of the two vectors
Exploring concepts of distance, displacement, frame of reference, and vector addition in relation to motion in physical science. Learn how to measure and understand motion using these fundamental principles.
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Presentation Transcript
Distance and Displacement Physical Science Unit 2
Frame of Reference To describe motion accurately and completely, a frame of reference is necessary frame of reference is a system of objects that are not moving with respect to one another. Ex. A butterfly flying up and down in front of a person Relative motion is movement in relation to a frame of reference. Ex. A car driving by someone standing on the side of the road
Measuring Distance Distance is the length of a path between two points. (only numerical) Distance from Madison to Flowood (not a straight line) The SI unit for measure distance is meter (m) For larger measurements of distance the kilometer (km) is used.
Measuring Displacement To describe an object s position relative to a given point, you need to know how far away and in what direction the object is from that point. Displacement is the direction from the starting point and the length of a straight line from the starting point to ending point (straight line distance). Numerical value and a direction
Vectors Displacement is an example of a vector Vectors are quantities that have magnitude and direction. The magnitude can be size, length, or amount Vector addition is the combining of vector magnitudes and directions
Displacement Along a Straight Line When two displacements represented by two vectors, have the same direction, you can add their magnitudes.
Continued.. When two displacements are in opposite directions, the magnitudes subtract from each other
Questions 1. What is a frame of reference? How is it used to measure motion? 2. How are distance and displacement similar and different? 3. How are displacements combined? 4. A girl who is watching a plane fly tells her friend that the plane isn t moving at all. Describe a frame of reference in which the girl s description would be true. 5. Is displacement more like the length of a rope that is pulled tight or the length of a coiled rope? Explain
Questions 6. Would you measure the height of a building in meters? Explain your reasoning. 7. Should your directions to a friend for traveling from one city to another include displacements or distances? Explain 8. The resultant vector of two particular displacement vectors does not equal the sum of the magnitudes of the individual vectors. Describe the directions of the two vectors
