Standard Science Primary 6 Interactions

Ravi wants to move a heavy box across the floor. He finds it easier to push the box when it is placed on a trolley with wheels. Why is this so?

A The wheels increase the gravitational force acting on the box.
B The wheels increase the contact area between the box and the floor.
C Rolling friction is less than sliding friction.
D The wheels increase the mass of the box.
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Worked Solution

Step 1: Pushing a box directly involves sliding friction. Step 2: Using a trolley introduces wheels, which use rolling motion. Step 3: Rolling friction is significantly lower than sliding friction, making it easier to overcome and move the load.

Correct answer: Rolling friction is less than sliding friction.

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