Siti wants to move a heavy wooden crate across the floor. She finds it difficult at first, but it becomes easier once she places several round pipes under the crate. Why?
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Worked Solution
Step 1: Identify the initial force opposing motion (sliding friction).
Step 2: Recognize the change (adding round pipes creates rolling motion).
Step 3: Rolling friction is significantly less than sliding friction.
Step 4: Therefore, it requires less force to move the crate.
Correct answer: Sliding friction was replaced by rolling friction.
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