Standard Science Primary 6 Interactions

Ravi is trying to move a heavy cabinet. He finds it easier to push the cabinet after placing a few cylindrical rollers underneath it. Why?

A The rollers create a magnetic repulsion.
B The rollers increase the surface area in contact with the floor.
C Rolling friction is less than sliding friction.
D The rollers increase the weight of the cabinet.
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Worked Solution

Step 1: Moving an object directly against the floor involves sliding friction. Step [2-9]: Using rollers converts the motion into rolling motion. Step [2-9]: Rolling friction is significantly weaker than sliding friction, making the task easier.

Correct answer: Rolling friction is less than sliding friction.

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