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Oops! Methodology wrong as well?

How come it is not: 1'' = 2.54cm = diameter 2.54÷2 = Radius = 1.27cm π(1.27)² = 5.067074... = a₁ (1 side of the squares circular, drill area, which can be substituted from the area of the face of the square): area of sq.face = 2.54² = 6.4516cm = a₂ a₂ - a₁ = 6.4516 - 5.0670 = 1.3845...

Homework Statement My investigation report concerns Newton's second law and testing it to conclude that the Force is directly proportional to the acceleration. We measured a cart down a runway with mass increments of 10g per result. Starting off with 100g attached to the cart via thread (+...