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Force and motion

Force and Motion

Measuring A, B, C, & D

Mini-Lesson on Measuring B & C

Cut a strip from the Template. * How long is it?

  • If this strip was taped into the book, which link lengths would it contain?
  • What will these link lengths have to add up to? Now fold the strip at the line numbered 5. Unfold it and mark the fold line with a marker. Then, * Label the two link lengths that would be on the strip if it were taped into the book.
  • What are the link lengths B & C?

Many students will say that both B & C are 5 cm., because that’s what the number says at the fold line. They couldn’t be, because B and C have to add up to the total strip length, which is 12 cm., not 5 + 5 = 10 cm.

Suppose C is indeed 5 cm., because the numbers start at 0 on the left end. But what is B? Help students see that B + C = 12 cm. We already know that C is 5 cm., so you can find B by subtracting this number from 12: B = 12 – 5 cm. = 7 cm.