Standard Science Primary 6 Interactions

Ravi is pushing a heavy box. He finds it easier to move the box if he places some round logs underneath it. Why is this so?

A The mass of the box is reduced.
B The surface area of the floor is increased.
C Sliding friction is changed to rolling friction.
D Gravity is reduced.
Show Worked Solution

Worked Solution

Step 1: Pushing a box directly involves sliding friction. Step [2-9]: Using logs introduces rolling motion. Step [2-9]: Rolling friction is much lower than sliding friction, making movement easier.

Correct answer: Sliding friction is changed to rolling friction.

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