NHHS_Sec4_phy_prelim_P3_ MS

2024 Phy Prelim Practical P3_NHHS_suggested marking scheme Question suggested answer marks 1 (a) (i) d value recorded with unit to nearest 0.1 mm o r better (range from 5.00 mm to 8.00 mm) 1 (ii) at least two measurements of time seen, to nearest 0.1 s or better (students need to show evidence that they have taken time for at least two cycles) average time, t, with unit and appropriate sf (range of t = 0.40s to 1.00 s) 1 1 (iii) Distance travelled = diameter of water surface (range from 16.5 cm to 17.5 cm) correct calculation of speed using candidate’s value with unit and appropriate sf 1 1 (c) Marking points • constant variables: • volume of water droplet • position of landing of water droplet • height from which water droplet is dropped 1 • description of procedures: • vary d (independent variable) and record t (dependent variable) • calculate 𝑣𝑣 1 • vary d to get at least 5 sets of t. 1 • plot a suitable graph: (eg. Plot v2 against d or v against √𝑑𝑑) together with sketch 1 • 𝛼𝛼 is the gradient of the graph (for v2 against d graph) 𝑜𝑜𝑜𝑜 𝛼𝛼 is the square of the gradient of the graph (for v against √𝑑𝑑 graph) 1 2 (a) (i) Marbel placed in between both masses. Both masses on edge / vertical and touching the scale 1 • difference in scale readings indicated • set square to arrange masses perpendicular to scale / to ensure masses are vertical (give max 1 mark if two masses are not used) 1 (ii) d value recorded to nearest mm (0.1 cm using ruler) (range = 1.6 – 1.7 cm) 1 (b) (i) d1 < less than or equal to their D, to nearest mm (0.1 cm) (around 1.2 cm) 1 1 0 v2 d 0 v √𝑑𝑑 or

(ii) correct calculation of A1 using candidate’s value with unit and appropriate sf (i.e using value from (b)(i)) accept mm2/cm2/m2 (c) (i) x and y recorded to nearest mm {x must be less than y} 1 (ii) correct calculation of F using candidate’s value with unit and appropriate sf 1 (iii) d2 > d1 and A2 >A1 with correct calculation of A2 using candidate’s value {to penalize for no unit and wrong sf} 1 (d) Any two form the list below clay-related factor from: • time that the force is applied • temperature (of room or clay) • type of modelling clay / hardness / malleability of clay force related factor from: • force used/ total mass hung • diameter / size / mass of ball / weight of ball / same ball used (glass or wooden) • weight of wooden strip • same x and y values • time that the force is applied 1 1 3 (b) TR value recorded with unit to nearest 0.1 °C (sensible value) (around 32.0 °C) V R value recorded with unit to nearest 0.05 V (sensible value) (around = 3.60 V) 1 (c) (i) TW value recorded with unit to nearest 0.1 °C (sensible value) around 75.0 °C to = 95.0 °C V W value recorded with unit to nearest 0.05 V (sensible value) around 2.00 V 1 (ii) Correct