Bellwork 2/24 Which equation expresses Newton’s second law of motion? A. F = ma B. F = m __ a C. F...
-
Upload
dayna-mills -
Category
Documents
-
view
213 -
download
0
Transcript of Bellwork 2/24 Which equation expresses Newton’s second law of motion? A. F = ma B. F = m __ a C. F...
Bellwork 2/24Which equation expresses Newton’s second law of motion?A. F = maB. F = m __ aC. F = m − aD. F = m + a
Weather Forecasting
FrontsA boundary between 2 air masses of different
density, moisture, or temperatureRepresented on weather maps by various
types of curving linesCloudiness, precipitation and storms
sometimes occur at frontal boundaries
Types of fronts1. Cold fronts2. Warm fronts3. Occluded fronts4. Stationary fronts
Cold fronts – draw pictureShown on a map as a blue line with trianglesOccurs when colder air advances toward
warm airCold air wedges under warm air
Warm fronts – draw pictureShown on a map as a red line with
semicirclesOccurs when lighter, warmer air advances
over heavier, colder air
When cold and warm fronts meetWarm air is lifted, it cools and water vapor
condenses, forming cloudsWhen the temperature difference between
the cold and warm air is large or the cold front moves in quickly:Thunderstorms and even tornadoes may form
warm & cold fronts – draw pictures
Occluded frontsInvolves 3 air masses of different
temperatures:1. Colder air2. Cool air3. Warm air
May form when a cold air mass moves toward cool air with warm air between the two
The colder air forces the warm air upward, closing off the warm air from the surface
Shown on maps as purple lines with triangles and semicircles
Occluded fronts- draw picture
Stationary frontsOccurs when a boundary between air masses
stops advancingMay remain in the same place for several
daysProducing light wind and precipitationShown on maps as an alternating red and
blue lineRed semicircles point toward the cold airBlue triangles point toward the warm air
Stationary fronts – draw picture
Why does weather change?Air massesAir pressureFronts
Severe Weather
Thunderstorms Heavy rain falls, lightning flashes, thunder
roars, and hail might fallOccur in warm, moist air masses and along
frontsOccur when warm air is lifted rapidly as
cooler air sinks
Tornadoes A violently rotating column of air in contact
with the groundOccur along fronts when cold fronts rapidly
approach warm fronts
Hurricanes Read pages 610 – 611Answer questions 3a and 3b
Extra InformationA barometer is used to measure barometric
pressureMaritime refers to waterContinental refers to landThe National Weather Service (NWS) is
responsible for tracking hurricanesSatellite imagery has significantly improved
in the last 20 years to help us have a better understanding of hurricanes
The warmest part of a hurricane is the eye of the storm
Bellwork 2/25Scientists are studying the use of vegetable oil as an automotive fuel.Which of these is a logical justification for continuing this research?A. The research may also help scientists develop new vegetables for use as food.B. Vegetable oil can be purchased at grocery stores, so there would be less need for fueling stations.C. Using vegetable oil will increase the number of cars that can be used byincreasing the available fuel for cars.D. The fossil fuel used to make gasoline is becoming a limited resource, while vegetable oil is made of plants crops that are renewable.
Classwork 2/25Complete weather forecasting worksheetTurn in when finished.If you do not finish in class, it is homework.If you finish before the bell rings, read a book
or work on something from another class.
Bellwork 2/26Power grids use alternating current (AC) in transmission and distribution systems. Which statement explains why AC is used instead of direct current (DC)?F. Transmission wires cannot carry enough direct current to supply the needs of the power grid.G. The voltage can be changed in an alternating current system to transferenergy more efficiently.H. Electrical energy must be transmitted as alternating current because that is how it is produced at power plants.J. Direct current would not be useful to electric company customers because appliances operate on alternating current.
Classwork 2/26You will work with a partner to complete the
Coriolis worksheet.If you finish before we start to go over it,
read a book or Scholastic magazine.