Advanced Science Primary 6 Interactions

Ahmad wants to move a heavy cabinet across a carpeted floor. He places several plastic sheets under the cabinet. Why does this make it easier to move the cabinet?

A The plastic sheets increase the mass of the cabinet.
B The plastic sheets increase the contact area.
C The plastic sheets are smoother than the carpet, reducing friction.
D The plastic sheets reduce the gravitational force.
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Worked Solution

Step 1: Identify the force opposing motion (Friction). Step [2-9]: Friction depends on the roughness of the surfaces in contact. Step [2-9]: Plastic is smoother than carpet, so replacing the carpet-cabinet contact with plastic-carpet/cabinet contact reduces the overall frictional force.

Correct answer: The plastic sheets are smoother than the carpet, reducing friction.

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