Advanced Science Primary 6 Interactions

Ravi pushed a 5kg box across a rough floor. He then placed the same 5kg box on a trolley with wheels and pushed it with the same force. Why did the box on the trolley move a further distance?

A The wheels changed the direction of the pushing force.
B The wheels increased the mass of the box.
C The wheels increased the gravitational force.
D The wheels reduced the frictional force between the box and the floor.
Show Worked Solution

Worked Solution

Step 1: Identify that the contact surface changed from sliding to rolling. Step [2-9]: Rolling friction is generally lower than sliding friction. Step [2-9]: Lower friction results in less opposition to motion, allowing the box to travel further.

Correct answer: The wheels reduced the frictional force between the box and the floor.

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