Which of the two is generally LARGER for the same object on the same surface — static friction or sliding friction?
ASliding friction is larger
BThey are always equal
CStatic friction is larger
DSliding friction can be larger or smaller depending on weight
Answer & Solution
Correct answer: C. Static friction is larger
Once the object starts sliding, the irregularities of the two surfaces do not get enough time to lock into one another, so the sliding friction is slightly smaller than the static friction. That is why starting a heavy box from rest takes more force than keeping it moving.
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