Introductory Physics Course Reform at UA – Current Status and Lessons Learned
introductory lessons in physics
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Transcript of introductory lessons in physics
Imagine: Looking for a friend who is sick whose house is 5 kilometers away from the school…
Search for your lost brother or sister to unknown place 4 kilometers from the market…
Listen to the radio on the weather forecast of the coming typhoon but was not specified on to where it will strike…
SCALARS versus VECTORS
To which way will
he pass in order to catch up with the class…?
In Physics, everything must be specified. Each quantities must be
described according to its characteristics and behavior.
One of which is through directions. Considered the
example of a moving typhoon and a tornado…
A typhoon or a tornado is unpredictable in nature. They
should be monitored every now and then in order to determine its movements in order to warn the
people of their effects to the places it will pass.
(typhoon video clips ≥ 1&2)
What really happened during the typhoon “FRANK”?
FRANK
Weather forecast by PAGASA is
very important
in cases like this, since it
serves as the eye of the public to where direction
the typhoon is
headed to…
SCALARS and VECTORS
How important are the directions?
To best understand this, let’s associate direction to scalars and
vectors. With this, we would know if to what quantity it is very
important.
“What Scalars and Vectors?”Scalars are quantities having numerical values but do not need to be specified it its movement to where it is headed to or located.Vectors are quantities having numerical values and a specified direction for its movement or location.
SCALARS and VECTORS
SCALARSSCALARS VECTORSVECTORSLength, Length,
Distance, Distance, Speed, Time, Speed, Time, Area, Volume, Area, Volume, Temperature, Temperature, Mass, Amount Mass, Amount
of Mater, of Mater, Intensity, and Intensity, and many moremany more
Displacement, Displacement, Velocity, Velocity,
Acceleration, Acceleration, Force, Work, Force, Work,
Weight, Weight, Pressure, and Pressure, and many more many more
especially those especially those pairs with pairs with directions.directions.
These are the common examples of scalars and vectors:
Directions in VECTORS
Basically, there are four (4) known directions: They are:
1. NORTH2. SOUTH3. EAST4. WESTFour (4) other
directions were base on the known directions. These other directions are:
1. North East 2. North West
3. South East 4. South West
SCALARS and VECTORS
NW
SW
NE
SE
W E
N
S
SCALARS and VECTORS
Scalars can be represented as:
Vectors can be represented as:
Length of the line is the magnitudewith no
direction.
Length of the line is the magnitudeand arrowhead points the direction.
SCALARS and VECTORS
Vectors can also be plotted in a Cartesian coordinate system; or simply known as x – y coordinate
system.y
x
Vectors expressed in
4 or 8 directions can
also be plotted using x and y axis. y-axis can be
either north or south; x-axis can be
either east or west. Those
other directions will just fall within
the four quadrants of
the plane.
SCALARS and VECTORSVectors may exist in 2 or even
more.
SCALARS and VECTORS
SCALARS and VECTORS