SS 1 NOTE OF LESSON (wK 1)
TOPIC : HEAT TRANSFER
Heat can be transferred from one point to another in three media.These are solid,liquid and gaseous media.Process of heat transfers in each medium are conduction,convection and radiation.
CONDUCTION : Conduction is the transfer of heat through a material from one place to another,by the vibration or motion of the molecules of the material.
CONVECTION: Convection is the process by which Heat energy is transferred in a fluid by the actual movement of the heated fluid. Convection occurs in fluids,e.g.gases and liquid.
RADIATION: Radiation can be defined as the process by which heat energy is transferred from one point to another without heating the intervening medium.Radiation gives off a form of energy which is called radiant energy.
ASSIGNMENT
(1) write down the applications of conduction,convection and radiation.
(2) draw a labelled diagram of a vacuum flask and write down the functions of the various parts.
(3) explain with experiment,why water is a bad conductor of heat.
(4) what are land and sea breezes.Differentiate between the two.
Consult the following textbooks for further studies.
(1) Principle of physics,M. Nelkon
(2) Senior Secondary Physics, P.N.Okeke,F.N.Okeke,S.F.Akande.
(3) Essential Physics for Senior Secondary Schools.O.E.Farinde,H.E.Ehimetalor,S.K.Dada
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SS 2 NOTE OF LESSON (WK 1)
TOPIC ; SURFACE TENSION
Surface tension is defined as the force per unit length on either side of the imaginary line drawn on the liquid Surface at rest. The surface of a liquid behaves as if it was covered with an elastic skin or as if it was in a state of tension.
Surface tension is the force that causes the surface of a liquid to act like a stretched elastic skin.It is a vector quantity and measured in N/m.
REDUCTION OF SURFACE TENSION
Surface tension can be reduced through one of the following ways:
(1) by adding detergent/soap to the water.
(2) by adding Camphor to the water.
(3) by adding oil to the water.
(4) by adding alcohol to the water.
(5) by using kerosene.
(6) by boiling the water.
APPLICATIONS OF SURFACE TENSION
(1) Surface tension can be used in the production or manufacturing of rainproof or waterproof.
(2) Absorption of ink with blotting paper.
(3) Rising of oil in lamp Wicks.
(4) Movement of melted wax into the neck of a burning candle.
ASSIGNMENT
(1) Use molecular theory to explain Surface tension.
(2) Define angle of contact.
(3) Draw sketches,to show angles of contact for a capillary tube dipped vertically on(a) water(b) mercury.
(4) State three examples to illustrate the effects of Surface tension.
REFERENCE MATERIALS
(1) Principles of Physics,M.Nelkon.
(2) Senior Secondary Physics,P. N.Okeke,F.N.Okeke,S.F.Akande.
(3) Essential Physics For Senior Secondary Schools,O. E.Farinde,S.K.Dada,H.E.Ehimetalor.
Submit Assignment via WhatsApp to 0806 651 7214