How does a lubricant help in reducing friction?

A lubricant helps in reducing friction by forming a thin layer between two surfaces, preventing direct contact and allowing smoother movement.

Friction is a force that resists the motion of two surfaces in contact. While some friction is useful, too much friction causes wear and tear. Lubricants such as oil, grease, and graphite are used to reduce this resistance.

Mechanism

• Lubricants create a film between surfaces.
• This film reduces surface roughness contact.
• Less force is needed for movement.
• Heat generation is minimized.

Examples of Lubricants

• Engine oil in vehicles.
• Grease in bicycle chains.
• Graphite in locks.