AP Physics 1 Question 71: Answer and Explanation

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Question: 71

1. A wooden block experiences a frictional force, f, as it slides across a table. If a block of the same material with half the height and twice the length were to slide across the table, what would be the frictional force it experienced?

  • A. (1/2)f
  • B. f
  • C. 2f
  • D. 4f

Correct Answer: B


B The same two materials would be in contact, so the coefficient of friction would remain the same. The object's mass would also be the same, so the normal force would remain constant. Since Ff = μFN, and neither of those terms changed, the frictional force will also be unchanged.