Change the tense when:
1. the operative verb (e.g. said, ordered, told) is in the past tense, and
2. if the statement is not a fact.
If the statement is a scientific fact, do not change the tense. See Rule #1.
Source: www.edufind.com
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)