Advanced Science Primary 6 Interactions

Which of the following would NOT reduce the friction between two moving surfaces?

A Using ball bearings
B Increasing the mass of the object
C Adding a layer of oil
D Using a cushion of air
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Worked Solution

Step 1: Lubricants (oil), ball bearings, and air cushions are methods to reduce friction. Step [2-9]: Increasing the mass of an object increases the pressing force against the surface. Step [2-9]: An increased pressing force results in higher friction.

Correct answer: Increasing the mass of the object

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