Standard Science Primary 6 Interactions

Ravi is pushing a heavy box across a floor. He finds it easier to push the box when it is on a trolley with wheels than when it is directly on the floor. Which of the following best explains this?

A The wheels reduce the area of contact between the box and the floor.
B The wheels convert sliding friction into rolling friction.
C The wheels increase the gravitational force.
D The wheels increase the mass of the box.
Show Worked Solution

Worked Solution

Step 1: Identify the change in setup (adding wheels). Step [2-9]: Wheels allow the object to roll instead of slide. Step [2-9]: Rolling friction is significantly lower than sliding friction, making it easier to move.

Correct answer: The wheels convert sliding friction into rolling friction.

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