onWindow":[{"id":"ac577d64-1064-4398-8651-7aa8e0a2a67c","revisionId":"c7e031e3-031d-4189-a86b-975c48fcc5e0","questionNumber":null,"questionType":"LA","specification":"","difficulty":5,"difficultyBand":"medium","totalMarks":7,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"c81c67c4-ba38-46c1-918d-d29f06cf85a3","label":"a","content":"An automated storage crane has a total weight of \$15\\,600\\text{ N}\$. The crane is supported by six feet, each with a flat contact area of \$13\\text{ cm}^2\$ resting on a metal track.\n\nCalculate the pressure exerted by the crane on the track.\n\nAnswer = ____________________ \$\\text{N/cm}^2\$","markscheme":"- Calculates the total contact area: $6 \\times 13\\text{ cm}^2 = 78\\text{ cm}^2$ M1\n- Uses $\\text{Pressure} = \\frac{\\text{Force}}{\\text{Area}}$ to calculate the pressure M1\n- Obtains $200\\text{ N/cm}^2$ A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"total_area_then_pressure","label":"Total area then pressure","steps":[{"type":"hyper_latex","block":{"nodes":[{"latex":"A_{\\mathrm{total}}=6\\times13\\ \\mathrm{cm}^2"},{"latex":"A_{\\mathrm{total}}=78\\ \\mathrm{cm}^2"}]},"order":1,"title":"Find the total area","description":"All six feet touch the track, so their contact areas must be added. This earns the first method mark."},{"type":"hyper_latex","block":{"nodes":[{"latex":"p = \\frac{F}{A}"},{"latex":"p = \\frac{15\\,600\\ \\mathrm{N}}{78\\ \\mathrm{cm}^2}"},{"latex":"p = 200\\ \\mathrm{N/cm}^2"}]},"order":2,"title":"Use the pressure equation","description":"Pressure means force divided by contact area. Substituting the weight and total area earns the second method mark. Obtaining 200 N/cm² earns the accuracy mark."}]}],"generatedAt":"2026-07-22T11:34:20.582Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"600e2c18-1c2d-40ff-8f7b-b46ccaa5cc78","label":"b","content":"Fall-arrest safety harnesses worn by wind-turbine maintenance technicians are made of wide straps that stretch slightly if a technician falls.\n\nExplain why it is important that the harness straps are **wide**.","markscheme":"- **(i)** Wide straps increase the surface area over which the force is distributed, thereby reducing the pressure exerted on the wearer's body B1","marks":1,"order":1,"markingRubric":null,"explanation":{"methods":[{"id":"pressure_distribution","label":"Spread the force","steps":[{"type":"text","order":0,"title":"State the explanation","content":"Wide straps spread the stopping force over a larger area of the wearer's body, reducing the pressure on the body. **This earns B1:** it links the larger surface area to lower pressure.","highlights":[{"text":"**wide**","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:38:02.218Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"d4b679eb-d7c3-48c1-8986-7b006f9fb745","label":"c","content":"Explain why it is important that the harness material is **stretchy**.","markscheme":"- **(ii)** Stretchy material increases the time or distance over which the technician decelerates during a fall, which reduces the peak impact force exerted B1","marks":1,"order":2,"markingRubric":null,"explanation":{"methods":[{"id":"increase_stopping_time","label":"Increase the stopping time","steps":[{"type":"text","order":0,"title":"Identify the key feature","content":"The harness is **stretchy**, so it can extend as the technician falls. That means the technician does not come to rest all at once.","highlights":[{"text":"harness material is **stretchy**","location":"specification"}]},{"type":"text","order":1,"title":"Link stretch to force","content":"Because the harness stretches, the technician decelerates (slows down) over a longer time or distance. This reduces the peak impact force: the greatest force during the stop.\n\nThis complete cause-and-effect link earns the **B1** mark."}]}],"generatedAt":"2026-07-22T11:38:53.054Z","modelVersion":"gpt-5.6-terra+diag

Pressure

Question 21

Pressure Questions

Pressure

Question 21

Pressure Questions