Answer:
The force of friction is reduced between the blocks by adding the dishwashing liquid because the liquid is slippery and this makes it difficult for the two surfaces to contact each other directly. Therefore the blocks slip past each other rather than grinding against each other, producing less friction.
Explanation:
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Answer:
I think that it's A.
Explanation:
It's not D, because A & C contrast each other.
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Answer:
the Frequency remains constant
