What term describes the force that occurs when two surfaces rub against each other, producing heat?

What term describes the force that occurs when two surfaces rub against each other, producing heat?

• A. Drag
• B. Force
• C. Momentum
• D. Friction

Answer: (D)

Friction is the force that occurs when two surfaces rub against each other, producing heat. As the surfaces slide, their tiny irregularities catch on one another, converting some of the moving energy into thermal energy, which we feel as warmth. This explains everyday examples like rubbing hands together. The other terms don’t fit this scenario: drag is resistance from a fluid like air, force is a general push or pull, and momentum is a property describing the motion of an object.

Friction is the force that occurs when two surfaces rub against each other, producing heat. As the surfaces slide, their tiny irregularities catch on one another, converting some of the moving energy into thermal energy, which we feel as warmth. This explains everyday examples like rubbing hands together. The other terms don’t fit this scenario: drag is resistance from a fluid like air, force is a general push or pull, and momentum is a property describing the motion of an object.