Question

The force of friction arises due to contact between surfaces .It is an example of_______
A. non-contact force
B. muscular force
C. contact force
D. Gravitation force

Answer 1

Hint: Before going through the question we should first know about friction. Friction is beneficial and essential for providing traction and facilitating movement on ground. For acceleration, deceleration, and changing direction, most land vehicles depend on friction. Sudden traction failure can result in a loss of control and an accident.

Complete step by step answer:
Friction is defined as the force that opposes the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
The different types of force of friction are as follows:
1. Dry Friction: The force that opposes the relative lateral motion of two solid surfaces in contact is known as dry friction. Static friction ("stiction") between non-moving surfaces and kinetic friction ("friction") between moving surfaces are the two types of dry friction. Dry friction, with the exception of atomic or molecular friction, is caused by the interaction of surface features known as asperities.
2. Fluid Friction: The friction between layers of a viscous fluid that are moving relative to each other is referred to as fluid friction.
3.Lubricated Friction: Lubricated friction occurs when two rigid surfaces are separated by a lubricant fluid.
4.Skin Friction: Skin friction is a part of drag, which is the force that prevents a fluid from moving over a body's surface.
5. Internal Friction: Internal friction is the force that opposes motion between the components that make up a solid material as it deforms.
The friction between two surfaces transforms kinetic energy into thermal energy as they shift relative to each other (that is, it converts work to heat). The use of friction produced by rubbing pieces of wood together to start a fire is an example of how this property can have drastic consequences. As motion with friction occurs, such as when a viscous fluid is agitated, kinetic energy is converted to thermal energy. Wear is another significant consequence of many forms of friction, which can result in performance degradation or component damage.
Hence, from all of the above information we can understand that Friction is the force that a surface exerts on an object that is moving over it. As a result, it's a contact force.

So, the correct answer is “Option C”.

Note: Friction is not a fundamental force in and of itself. Inter-surface adhesion, surface roughness, surface deformation, and surface pollution all contribute to dry friction. Because of the complexity of these interactions, it is impossible to calculate friction from first principles, necessitating the use of analytical methods for study and theory creation.