Question

What is define of BALL BEARING and INTERLOCKING

Answer 1

ball bearing

A friction-reducing bearing consisting essentially of a ring-shaped track containing freely revolving hard metal balls against which a rotating shaft or other part turns.

A hard ball used in such a bearing.

interlocking

(of two or more things) engage with each other by overlapping or by the fitting together of projections and recesses.

i1st pic ball bearing

2nd interlocking...

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