.ocr.org.uk/Images/705129-equation-sheet-physics-a.pdf","initialIndex":65,"initialQuestionWindow":[{"id":"a2e1dd0a-2aed-4f35-adcb-7277c9466d32","revisionId":"b0e376bf-3249-4278-afb8-5e2bdc573136","questionNumber":null,"questionType":"LA","specification":"","difficulty":6,"difficultyBand":"medium","totalMarks":9,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"f9eff0a2-de04-4fff-9001-798289dc60d3","label":"a","content":"A worker uses a pry bar (lever) to lift a heavy wooden crate.\n\n![A straight pry bar resting on a pivot. The long left arm of the pry bar, from the pivot to the end where the downward effort force is applied, has a length of 1.6 m. The short right arm, from the pivot to the end where the upward load force acts on the wooden crate, has a length of 0.25 m.](https://assets.mathsgenie.co.uk/aqa-qb/ecb13807-c73f-4b73-b971-3945d09c8e32.png)\n\nExplain why the effort force needed to lift the crate is **less** than the load force.","markscheme":"- States that the perpendicular distance from the pivot to the effort force ($1.6\\text{ m}$) is greater than that to the load force ($0.25\\text{ m}$) B1\n- Explains that a smaller force is needed to produce the same moment B1","marks":2,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"moments_lever","label":"Use moments","steps":[{"type":"text","order":0,"title":"Compare the lever arms","content":"The perpendicular distance from the pivot to the effort force's line of action is $1.6\\,\\text{m}$, which is longer than the $0.25\\,\\text{m}$ perpendicular distance to the load force's line of action. This earns **B1** because it identifies the relevant perpendicular distances.","highlights":[{"text":"A worker uses a pry bar (lever) to lift a heavy wooden crate.","location":"specification"}]},{"type":"text","order":1,"title":"Link distance and moment","content":"For the same force, the longer perpendicular distance produces a larger moment. Therefore, at the point where the crate is just lifted, an effort force smaller than the load force can produce the same moment. This earns **B1** for explaining that a smaller force produces the same moment."}]}],"generatedAt":"2026-07-22T11:11:12.069Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"fd21e546-0de6-4451-ae69-d03a48223227","label":"b","content":"The effort force needed to lift the crate is \$120\\text{ N}\$.\n\nCalculate the load force.","markscheme":"- Applies the principle of moments: $F_{\\text{effort}} \\times d_{\\text{effort}} = F_{\\text{load}} \\times d_{\\text{load}}$ M1\n- Equates moments: $120 \\times 1.6 = 0.25 \\times F_{\\text{load}}$ M1\n- Calculates the load force as $768\\text{ N}$ A1","marks":3,"order":1,"markingRubric":null,"explanation":null,"options":[]},{"id":"a87ee93a-8f90-4c66-81ae-2e81e4712369","label":"c","content":"The worker places a toolbox on a level floor.\n\nDescribe the **two** forces in the interaction (action-reaction) pair between the toolbox and the floor.","markscheme":"- Identifies one force as the downward force exerted by the toolbox on the floor B1\n- Identifies the other force as the upward normal contact force exerted by the floor on the toolbox B1","marks":2,"order":2,"markingRubric":null,"explanation":{"methods":[{"id":"action_reaction_pair","label":"Identify the interaction pair","steps":[{"type":"drawing","order":0,"title":"Picture the two objects","width":644,"height":331,"shapes":[{"id":"floor","type":"line","color":"black","points":[{"x":42,"y":195.7},{"x":602,"y":195.7}]},{"id":"toolbox","type":"line","color":"black","points":[{"x":238,"y":195.7},{"x":406,"y":195.7},{"x":406,"y":83.7},{"x":238,"y":83.7},{"x":238,"y":195.7}]},{"id":"upward_force","toX":352.8,"toY":99.4,"type":"arrow","color":"blue","fromX":352.8,"fromY":180},{"id":"downward_force","toX":352.8,"toY":282.5,"type":"arrow","color":"red","fromX":352.8,"fromY":200.2},{"id":"upward_force-label-leader","type":"line","color":"grey","points":[{"x"

Forces in action

Question 32

Forces in action Questions

Forces in action

Question 32

Forces in action Questions