Causes of Friction

Q. When a soft surface deforms and opposes motion of a body sliding on it, this is known as .

1. adhesion
2. roughness
3. plowing effect
4. interlocking

Q. When a soft surface deforms and opposes motion of a body sliding on it, this is known as .

1. adhesion
2. roughness
3. plowing effect
4. interlocking

Q. In which of the following examples is the plowing effect majorly seen?

1. A pen lying on a wooden table.
2. A block kept on a metallic table.
   
3. A heavy object placed on a carpet.
   
4. A book sliding over another book.
   

Q. When a soft surface deforms and opposes motion of a body sliding on it, this is known as .

1. adhesion
2. roughness
3. plowing effect
4. interlocking

Q.

What happens to friction when we decrease irregularities on two surfaces rubbing each other?
[2 marks]

Q. Which of the following statements is correct regarding friction between two surfaces in contact?

1. Friction exists between surfaces only if they are rough.
2. Friction is solely because of the interlocking of irregularities.
3. Friction can develop between smooth surfaces.
4. Friction exists between surfaces only if they are smooth.

Q. is due to presence of irregularities on a surface.

1. Softness
2. Hardness
3. Roughness
4. Smoothness

Q. When two smooth surfaces slide over each other, the primary cause of friction is .

1. adhesion
2. roughness
3. interlocking
4. deformation