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Which physical phenomenon is primarily responsible for dynamic friction?

24. Which physical phenomenon is primarily responsible for dynamic friction?

1. Adhesion between surfaces
2. Cohesion within the material
3. Electrostatic forces between surfaces
4. Gravity acting on the surfaces

Answer

The correct answer is: A) Adhesion between surfaces

Explanation

Dynamic friction occurs mainly by adhesive forces between the contacting surfaces. When two surfaces come into contact, molecules at the interface prefer to attach, producing frictional resistance.