{"id":2680,"date":"2023-10-03T11:36:39","date_gmt":"2023-10-03T11:36:39","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=2680"},"modified":"2023-10-03T11:38:43","modified_gmt":"2023-10-03T11:38:43","slug":"week-8-and-9-ss1-third-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-8-and-9-ss1-third-term-physics-notes\/","title":{"rendered":"Week 8 and 9 – SS1 Third Term Physics Notes"},"content":{"rendered":"

\u00a0 WEEK 8
\n<\/strong>TOPIC: CAPILIARITY
\n<\/strong>CONTENT:<\/strong> Definition of Capillarity
\n\u00a0\u00a0\u00a0\u00a0 Cohesion and adhesion
\n\u00a0\u00a0\u00a0\u00a0 Application of capillarity<\/p>\n

\u00a0Capillarity<\/strong> is defined as the tendency of liquids to rise or fall in narrow capillary tubes.
\nCohesive force<\/strong> is the force of attraction between molecules of the same substance
\nAdhesive force <\/strong>is the force of attraction between molecules of different substance or it refers to the force which makes molecules of different substance to attract.
\nApplication of Capillarity
\n<\/strong>Adhesion of water to glass is stronger than the cohesion of water, hence, when water is spilled on a clean glass surface, it wets the glass. The cohesion of mercury is greater than its adhesion to glass, hence, mercury spilled 0n glass forms small spherical droplets.
\nEVALUATION
\n<\/strong><\/p>\n

    \n
  1. Differentiate between cohesion and adhesion\n<\/li>\n
  2. Explain the rise of water in a glass capillary tube using kinetic theory
    \n\t\t\t<\/strong><\/li>\n<\/ol>\n

    Reading Assignment<\/strong> : Read more on capillarity \u2013 New school physics (pg104-105)<\/p>\n

    \t\tWEEKEND ASSIGNMENT
    \n<\/strong>1 Differentiate between cohesion and adhesion
    \n2.Explain the rise of water in a glass capillary tube using kinetic theory
    \n\t\t<\/strong>
    \n\u00a0
    \n\t\tWEEK 9
    \n<\/strong>TOPIC: ELASTICITY
    \n<\/strong>CONTENT<\/strong> : Definition of elasticity
    \n\u00a0\u00a0\u00a0\u00a0 Hook’s law
    \n\u00a0\u00a0\u00a0\u00a0 Tensile stress, tensile strain and young modulus
    \nElasticity<\/strong> is the tendency of a material to regain its original size or shape after deformation or after it has been compressed or extended.<\/p>\n

    \u00a0Hook’s law<\/strong> states that provided the elastic limit is not exceeded, the extension in an elastic material (wire) is proportional to the force applied i.e F\u03b1e
    \n F = Ke\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261
    \nWhere K is force constant, stiffness or elastic constant
    \nForce constant<\/strong> is the amount of force that causes a unit extension. It is the ratio of force to extension of an elastic material.
    \nK \u2192 force constant, stiffness or elastic constant<\/p>\n

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    \n\u00a0
    \n\u00a0A \u2192proportional limit
    \nL \u2192elastic limit
    \nB \u2192yield point
    \nOL \u2192 elastic deform
    \nBC\u2192plastic deform
    \nHook’s law applies up to the elastic limit. For load beyond L
    \n\t\t<\/sub>the wire (material) stretch permanently. The point where small \u2191 in load produces large extension is known as yield point.<\/strong>
    \n\tBreaking point<\/strong> is the point where the wire cannot withstand any further increase in load.
    \nYield point : <\/strong>it is the minimum stress\/load acting on an elastic material beyond which plastic deformation sets in.
    \nElastic limit<\/strong> is the maximum load (force) which a body can experience and still regain its original size.
    \nEVALUATION
    \n<\/strong>1. Define (a) elastic limit (b) elastic constant (c) yield point (d) breaking point
    \n2. State Hooke;s law of elasticity
    \nTensile stress <\/strong>is the force acting on a unit CSA of a wire\/rod or force per unit CSA of a wire or rod.
    \nTensile stress = Force\/Area \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.2
    \nTensile strain <\/strong>is the extension per unit length
    \nTensile strain = extension\/Original length \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..3
    \nYoung modulus<\/strong> can be defined as the ratio of tensile stress to tensile strain
    \nYoung modules = tensile stress\/ tensile strain\u2026\u2026\u2026\u2026\u2026\u2026\u2026..4
    \nEVALUATION
    \n<\/strong>1.Define young modulus of elasticity
    \n2. A spiral spring extends from a length of 10.01cm to 10.10cm when a force of 20N is applied on it.Calculate the force constant of the spring
    \nReading Assignment<\/strong> : Read more on elasticity \u2013 New school physics (pg 93-96)<\/p>\n

    \t\tWEEKEND ASSIGNMENT
    \n<\/strong>1.The SI unit of tensile stress is \u2026.. (a) N\/m (b) Nm (c) N\/m2<\/sup> (d) m2
    \n<\/sup>2.The SI unit of tensile strain is \u2026.. (a) N\/m (b) Nm (c) N\/m2<\/sup> (d) none of the above
    \n3. The SI unit of tensile strain is \u2026.. (a) N\/m (b) Nm (c) N\/m2<\/sup> (d) none of the above
    \n4. The SI unit of force constant, K is \u2026.. (a) N\/m (b) Nm (c) N\/m2<\/sup> (d) m
    \n\t\t<\/sup>5. Hooke’s law states that (a) F \u03b1 A (b)F \u03b1 e (c) E \u03b1 F (d) E \u03b1 A<\/p>\n

    \t\tTHEORY
    \n<\/strong><\/p>\n

      \n
    1. A wire is gradually stretched by loading it until it snaps (a) sketch a load- extension graph for the wire\n<\/li>\n
    2. indicate on the graph the elastic limit(E), yield point (Y) and breaking point (B)\n<\/li>\n<\/ol>\n

      \u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u00a0 WEEK 8 TOPIC: CAPILIARITY CONTENT: Definition of Capillarity \u00a0\u00a0\u00a0\u00a0 Cohesion and adhesion \u00a0\u00a0\u00a0\u00a0 Application…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,220],"tags":[],"class_list":["post-2680","post","type-post","status-publish","format-standard","hentry","category-posts","category-third-term-ss1-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2680","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=2680"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2680\/revisions"}],"predecessor-version":[{"id":2681,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2680\/revisions\/2681"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=2680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=2680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=2680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}