Question

2. Materials used for
reducing friction

(a) Lubricant
(b) Streamlined
(c) Static friction
(d) Sliding Friction​

Answer 1

Answer:

$\small\mathfrak{ \underline{\purple{a.lubricant.}}}$

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Answer 2

Answer:

The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example.

Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.