CTET Paper II (Mathematics and Science) 5 Jan 2022 Solved Paper

Concept:Friction opposes motion. Static, sliding, and rolling friction have different strengths. Static friction is the strongest, sliding friction is weaker, and rolling friction is the weakest.Explanation:When an object is at rest, surfaces interlock strongly, giving maximum friction (static). During sliding, less time for interlocking reduces friction. Rolling involves the least contact area and time, so friction is minimal. Hence, the order is: static friction > sliding friction > rolling friction. Mathematically: $μ_{static} > μ_{sliding} > μ_{rolling}$. Only option D matches this order: sliding friction is more than rolling friction but less than static friction.Answer:Option D: Sliding friction is more than the rolling friction but less than the static friction.