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Standard VIII
Physics
Polishing Surfaces in Contact to Change Friction
Question

The application of decreasing friction includes :
  1. Ball bearing used in moving parts of a machine
  2. All of the above
  3. The streamlined shape of an aircraft
  4. The layer of air between the hull of a hovecraft.

A
All of the above
B
The streamlined shape of an aircraft
C
The layer of air between the hull of a hovecraft.
D
Ball bearing used in moving parts of a machine
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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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