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Q40 (NDA-I/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

The statement ""friction force is a contact force while magnetic force is a non-contact force"" is

Result
Your answer: —  Â·  Correct: A
Explanation

The statement is always true because it describes the fundamental nature of these forces. Friction is classified as a contact force because it arises from the physical interaction and interlocking of irregularities between two surfaces in direct contact [3]. It acts only when objects are physically touching [4]. Conversely, magnetic force is a non-contact force because a magnet can exert a push or pull on magnetic materials or other magnets from a distance without physical contact [2]. While factors like temperature can influence the magnitude or strength of these forces—such as magnets losing properties above the Curie temperature [6] or friction varying with thermal conditions [5]—the fundamental classification of friction as a contact force and magnetic force as a non-contact force remains unchanged regardless of the environment or temperature [3].

Sources

  1. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Snapshots > p. 77
  2. [3] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Activity 5.3: Let us investigate > p. 68
  3. [4] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > 5.4.1 Contact forces > p. 66
  4. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Activity 5.5: Let us test > p. 69
  5. [6] https://www.sciencedirect.com/science/article/pii/S0021979724005137
  6. [5] https://ri.conicet.gov.ar/bitstream/handle/11336/5660/CONICET_Digital_Nro.7683_A.pdf?sequence=2
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