Q.

What kind of substances are known as lubricants

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a

They increase friction

b

Both A & B

c

They decrease friction

d

None of these

answer is B.

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Detailed Solution

Lubricants reduces friction force

  • Lubricants are substances used to reduce friction between two surfaces in contact.
  • They create a thin protective layer that prevents direct contact, ensuring smoother movement and minimizing wear and tear.
  • By decreasing friction, lubricants enhance the efficiency of machines, reduce energy loss, and prevent overheating.
  • Additionally, many lubricants provide protection against rust and corrosion, extending the lifespan of mechanical parts.
  • Examples include oils, grease, and solid lubricants like graphite, each designed for specific applications. Their primary role is to ensure smooth operation by reducing friction rather than increasing it.
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