Multiple choice

Why is it difficult to break an iron nail?

  1. Because its particles possess high kinetic energy

  2. Because its particles have strong forces of attraction

  3. Because its particles possess high mechanical energy

  4. Because its particles cannot be further divided into smaller particles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Particles of matter in the solid state have strong attractive forces between them. This force, known as the force of cohesion, keeps the particles together. Particles of iron have very strong forces of attraction, and the particles are tightly bonded to each other. So, it is difficult to overcome these forces and hence, break an iron nail. 

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