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Three blocks A, B and C are placed on the same table. They have the same weight of 60 N. Their contact areas with the table are: A → 0.6 m², B → 0.3 m², C → 0.1 m². The pressure on the table is:
AGreatest under B, smallest under A
BGreatest under A, smallest under C
CThe same under all three, because the weights are equal
DGreatest under C, smallest under A
Answer & Solution
Correct answer: D. Greatest under C, smallest under A
Pressure = Force / Area. With force fixed at 60 N: P_A = 60/0.6 = 100 Pa, P_B = 60/0.3 = 200 Pa, P_C = 60/0.1 = 600 Pa. So pressure is highest under C and lowest under A. Equal weights do NOT mean equal pressure — pressure depends on the area of contact, which is exactly why a sharp pencil tip pierces paper while the eraser does not, even though both feel the same force from your hand.
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