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Plan Fair Tests of Material Properties
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Grade 5
5.9 Plan Fair Tests of Material Properties
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A team is comparing the strength of two materials by how many books a beam holds. One beam has supports 20 cm apart and the other has supports 30 cm apart. Why should support spacing be controlled?
A
Spacing matters only for metal beams.
B
Wider spacing makes bending easier, changing the load the beam can hold even if the material is the same.
C
Closer spacing always breaks beams faster.
D
Support spacing only affects appearance, not strength.
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