Home » mcq » physics » The force of friction between two surfaces will increase if: A. A layer of lubricant is kept between the two surfaces B. The two surfaces are pressed harder C. Air gap is created between the two surfaces D. Irregularities on both the surfaces are removed
The force of friction between two surfaces will increase if: A. A layer of lubricant is kept between the two surfaces B. The two surfaces are pressed harder C. Air gap is created between the two surfaces D. Irregularities on both the surfaces are removed
A layer of lubricant is kept between the two surfaces
The two surfaces are pressed harder
Air gap is created between the two surfaces
Irregularities on both the surfaces are removed
Answer is Wrong!
Answer is Right!
The correct answer is: C. Air gap is created between the two surfaces.
Friction is a force that opposes the relative motion of two objects or materials. It is caused by the interaction of the microscopic surface features of the two materials. When two surfaces are in contact, there are many small bumps and valleys on each surface. These bumps and valleys interlock, creating
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a rough surface. When the surfaces are moved relative to each other, the bumps and valleys rub against each other, causing friction.
The force of friction is affected by several factors, including the following:
The nature of the two surfaces in contact. Rough surfaces have more friction than smooth surfaces.
The amount of force pressing the two surfaces together. The harder the surfaces are pressed together, the greater the force of friction.
The presence of a lubricant. A lubricant is a substance that reduces friction between two surfaces. It does this by forming a thin film between the surfaces, which prevents them from coming into direct contact.
When an air gap is created between two surfaces, the force of friction is reduced. This is because the air molecules in the gap act as a lubricant, preventing the surfaces from coming into direct contact.
The other options are incorrect because they would increase the force of friction.
Option A: A layer of lubricant is kept between the two surfaces. A lubricant reduces friction by forming a thin film between the surfaces, which prevents them from coming into direct contact.
Option B: The two surfaces are pressed harder. The harder the surfaces are pressed together, the greater the force of friction.
Option D: Irregularities on both the surfaces are removed. Irregularities on the surfaces increase the surface area of contact, which increases the force of friction.