As ‘n mens na die aardbol kyk, is die Noordpool bo en die Suidpool is onder. Die noordpoolgebied word ook Arktika, en die suidpoolgebied word ook die Antarktika genoem. Dit is van die koudste dele in die hele wêreld en baie dele is die hele jaar met ys bedek.
Soorte ys
Ys wat op land vorm, word ysdekke genoem.
Ysriviere wat in die berge vorm en stadig deur die land na die see beweeg, word gletsers genoem.
Drywende ys wat op die see vorm, word pakys genoem.
Soos die aarde rondom die son wentel, verander die weer in patrone van seisoene. Gedurende die warm maande van die somer bereik meer sonligenergie die aarde as in die koue wintermaande. Hoe nader aan die pole ‘n mens woon, hoe duideliker is die verandering. Baie plante en diere se leefwyse is volgens die seisoene aangepas.
Herfs
Gedurende die herfs begin baie diertjies gereed maak vir die winter wanneer dit vir sommige diere moeilik is om kos te vind. Hulle maak dus kos bymekaar en bêre dit op ‘n veilige plek. Sommige voëls migreer na warmer dele van die wêreld.
Sommige bome verloor hulle blare in die herfs.
Winter
Die meeste diere se pels begin dikker word om aan te pas by die winterkoue. Hulle het net ‘n paar dinge nodig om die winter te oorleef, nl. kos, skuiling en water. Sommige diere eet baie kos net voor die ergste winterkoue en gaan slaap dan om energie te bespaar. Ons sê hulle hiberneer. Jy kan voëls in jou tuin help om te oorleef deur vir hulle kossies op ‘n voertafel te gee.
Die bome wat hulle blare verloor het, bewaar die nuwe blaartjies in die botsels vir die volgende jaar.
Lente
Die bloeisels en botsels is nou oral te sien wanneer nuwe blaartjies en blomme te voorskyn kom. Diertjies begin nou weer aktief raak en maak hulle skuilings gereed, indien daar dalk kleintjies gaan kom. Diere wat gehiberneer het, word nou wakker. Die warmte van die lente en die lentereën laat die grassies weer groei vir die diere om te eet.
Die voëls wat migreer het, kom nou terug en begin nessies bou vir die kleintjies. Wanneer die eiertjies in die laat lente uitbroei, sal daar genoeg insekte vir hulle wees om te eet.
Somer
Plante groei nou vinnig, want daar is baie sonlig. Diere soek skuiling in die skaduwee as dit te warm word. Baie diere kry nou kleintjies wat opgepas of versorg moet word. Diere soek water om koel te bly.
Hou ‘n uitstalling van elke seisoen in julle klas. Bring enigiets skool toe wat met ‘n spesifieke seisoen te doen het.
Assessering
LEERUITKOMS 1:WETENSKAPLIKE ONDERSOEK
Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.
Assesseringstandaard
Dis duidelik wanneer die leerder:
1.3 data evalueer en bevindinge kommunikeer.
Memorandum
Mnr. Breinsel:
Hoekom is dit so koud by die pole?Antwoord:
Wanneer die son op die aarde se middellyn skyn, is al die sonstrale bymekaar en daarom is dit so warm daar. Soos die aarde na bo en onder ‘n bol vorm, versprei die sonstrale oor ‘n wyer area, dus raak die sonstrale swakker en dus is die pole koud.
Mnr. Breinsel:
Hoe vorm ‘n ysberg?
maak vir jouself een om te kyk watter groot deel onder die water is en watter deel bo uitsteek. watter gevaar hou dit vir skepe in? watter skip het so gesink in 1912?Antwoord:
Maak ‘n plastieksakkie vol water en vries dit. Haal die bevrore ys uit die sakkie en sit dit ‘n bak vol water. Kyk nou watter groot deel bly onder die water!
Groot dele van die ys van ysdekke en gletsers breek af en dryf op die see, maar soos hulle dieper na die warmer see toe dryf, smelt dit en breek op, maar sommige ysberge kan tot drie jaar neem om te smelt.
Titanic
Questions & Answers
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you.
Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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