Adhesion is the result of bond formed between the surfaces in contact.

True

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False

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Q. The angle of contact of a liquid-solid interface is explained by saying that the liquid surface must be ____________ to the resultant of adhesive, cohesive and gravitational forces acting on it.

Q. When two smooth surfaces are in contact, they start to form bonds and begin to stick to each other. This phenomenon is called ________.

Q. All forces are non contact forces because there is no actual touch because of repultion of atoms at microscopic level, but friction due to adhesion is formation of bonds of atoms so how is the first statement correct.

Choose odd one out giving reasons

1.Interlocking of surfaces , force of adhesion between two surfaces, highly polished surfaces

2. Oil, sand ,Grease,graphite powder

3. Aeroplanes, Birds, ship, cart,boat

On one hand you say that when two smooth, even surfaces slide over each other, there is adhesion between them which causes friction. On the other you say that there is no friction between two smooth surfaces. I'm not getting.

Mark the word SMOOTH.

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