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# The application of decreasing friction includes :Ball bearing used in moving parts of a machineAll of the aboveThe streamlined shape of an aircraftThe layer of air between the hull of a hovecraft.

A
Ball bearing used in moving parts of a machine
B
The streamlined shape of an aircraft
C
All of the above
D
The layer of air between the hull of a hovecraft.
Solution
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#### The application of decreasing friction is(i) Ball bearings used in moving parts of a machine.(ii) The stream lines shape of an aircraft.(iii) The layer of air between the hull of a hovecraft.

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