Standard Science Primary 6 Interactions

Ravi is pushing a heavy box. He finds it easier to move the box after placing several round wooden rods underneath it. Why?

A The rods make the box lighter.
B The rods increase the surface area in contact.
C The rods convert sliding friction to rolling friction.
D The rods increase the gravitational force.
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Worked Solution

Step 1: Pushing a box directly involves sliding friction. Step [2-9]: Rolling friction is generally much lower than sliding friction. Step [2-9]: Using rods (rollers) reduces the force needed to overcome friction.

Correct answer: The rods convert sliding friction to rolling friction.

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