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Scheme of Work – September to December 2016 SUBJECT: YEAR GROUP: Week Learning objectives 1 Recall and use the equation ρ = m/v Describe an experiment to determine the density of a liquid and regular solid Describe the determination of the density of an irregular shaped solid by the method of displacement Predict whether an object will float based on density data 2 Define speed and calculate from formula Plot and interpret a speed-time graph or a distance-time graph Recognise from the shape of a speed-time graph when a body is - at rest – moving with constant speed – accelerating Calculate the area under a speed-time graph to work out the distance travelled for motion with constant acceleration TEACHER: Activities and learning outcomes Density = mass ÷ volume Worked examples regular solids Practical density of irregular solid & liquid Ext & homework Unit test 3 Ext worked examples & homework Unit test Introduction forces – Newton’s 1st law Work through basic examples in force diagrams, identifying applicable force and direction e.g. aeroplane, motorcar, man on chair etc. Forces acting on bodies balanced & unbalanced (possible poster) Class exercise terminal velocity sky-diver.. working through stages of initial jump, acceleration to terminal velocity, effect of opening parachute and ground landing 4 Calculate speed / acceleration from gradient of distance-time speed-time graph Distinguish between speed and velocity Understand deceleration as a negative acceleration Recognise that a force may produce a change in size and shape of a body Recognise that if there is no resultant force on a body it either remains at rest or continues at constant speed in a straight line Recall and use the relation between force, mass and acceleration F = ma Describe qualitatively the motion of bodies falling in a uniform gravitational field with and without air resistance including reference Speed = distance ÷ time Essential concept of speed & simple worked examples Motion graphs concept of gradient for speed/time representing acceleration & distance time representing speed Ext worked examples Area under speed/time graph as total distance travelled Worked examples for basic linear changes e.g. trapezium Ext & homework Helicopter practical – terminal velocity Collation of results, completion of investigative practical form including graph drawing & interpretation Qualitative practical friction on moving bodies (circus) Force diagrams to terminal velocity F = ma Worked examples ext & homework 5 Describe qualitatively motion in a circular path due to a perpendicular force State Hooke’s Law and recall and use the expression F = kx where k is the spring constant Recognise the significance of ‘the limit of proportionality’ foran extension-load graph Circular motion practical / demo Work through examples of circular motion e.g. Earth around Sun, Moon around Earth, electron around nucleus, car on roundabout, hammer thrower; emphasis upon indentification of type of force providing centripetal action and instantaneous direction of travel Hooke’s law practical – proportional ext of spring – limit proportionality & elastic limit Draw F/x graph and determine k from gradient Worked example class ext and homework 6 State that weight is a gravitational force Recall and use the equation W = mg Describe and use the concept of weight as the effect of a gravitational field upon a mass Describe the moment of a force as a measure of its turning effect and give everyday examples Calculate moment using the product force x perpendicular distance from pivot Apply the principle of moments to different situations Perform and describe an experiment to show that there is no net moment on a body in equilibrium 7 8 Understand that vectors have a magnitude and direction Demonstrate an understanding of the difference between scalars and vectors and give common examples Determine graphically the resultant of two vectors Understand the concepts of momentum and impulse Concept of gravitational field & weight as a force W = mg (differentiate g as field strength as opposed to acceleration) Class discussion ‘g’ as applied to astronaut in space, on Moon, Mars or Jupiter Practical activity ‘see-saw’ – balancing moment Collate table of results and demonstrate Fd(left) = Fd (right) Extend concept of equilibrium with application balanced forces and balanced moments Demonstrate and discuss c.o.m. as applied to example objects e.g. retort stand, mobile phone, class chair Worked example ext and homework Practical c.o.m. 2 ply lamina Differentiate speed/velocity in terms direction Terms scalar & vector – examples Worked vector diagrams ext & homework Introduction momentum as ‘oomph’ Summary powerpoint presentation Demo momentum (Fletcher’s trolley, toy cars etc) P = mv Worked examples & ext Recall and use the equation p = mv Recall and use the equation for impulse Ft = mv – mu Apply the principle of conservation of momentum to solve simple problems in one dimension 9 Impulse as change in momentum Further examples & homework Mid term review, revision & assessment 10 Recognise that energy is transferred during events and processes Apply the principle of conservation of energy to simple examples Recall and use the expressions K.E. = ½mv2 And g.P.E. = mgh Practical energy circus – identify energy transfers in simple machines + battery + lightbulb + loudspeaker Conservation of energy applied to energy transfers Example ‘Sankey’ diagrams for light bulb, T.V., washing machine etc. K.E. & gPE formula & worked examples Ext & homework 11 Describe how electricity or other useful forms of energy may be obtained from: Chemical energy / water / geothermal resources / nuclear fission / the Sun / wind Give advantages and disadvantages of each method Show an understanding that energy is released by nuclear fusion in the Sun Recall and use the equation: Efficiency = useful energy output ÷ total energy input Demonstrate an understanding that work done = energy transferred Recall and use the equation W = Fd Recall and use the equation P = ΔE ÷ t Recall and use the equation p = F/A Relate the pressure beneath a liquid surface to depth and to density Recall and use the equation p = hρg Review energy resources renewable / non-renewable Emphasis difference energy resources & types Identify energy transfers applicable in electricity generation Independent student research adv / disadv & possible class presentation Efficiency understanding & formula Worked examples, ext & homework 12 13 14 Work & power formulae Worked examples, ext & homework Unit test Review / discuss simple examples big area – small pressure etc. Worked examples using formula Practical pressure on ground through feet Fish tank proof Ext and homework