Advanced Science Primary 6 Interactions

Ravi is trying to move a heavy cabinet. He finds it easier to move when he places it on a trolley with wheels. Why?

A The wheels increase the gravitational force.
B Rolling friction is less than sliding friction.
C The wheels make the cabinet lighter.
D Gravity is eliminated by the wheels.
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Worked Solution

Step 1: Moving the cabinet directly involves sliding friction. Step [2-9]: Using a trolley introduces rolling friction. Step [2-9]: Rolling friction is generally much smaller than sliding friction, making it easier to push.

Correct answer: Rolling friction is less than sliding friction.

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