why is the force of friction called contact force
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➡Friction is caused due to contact of two or more than two object, so frictional force is often called contact force
More Information :-
There are several types of friction:
➡Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact
Dry friction is subdivided into static friction ("stiction") between non moving surfaces and kinetic friction between moving surfaces With the exception of atomic or molecular friction
Dry friction generally arises from the interaction of surface features known as asperities
➡Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other
➡Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces
➡Skin friction is a component of drag the force resisting the motion of a fluid across the surface of a body
➡Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation
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Contact Force
Contact force is a force that is applied by objects in contact with each other. Contact force acts on a point of direct contact between the two objects. This force can either be continuous as a continuous force or can be momentary in the form of an impulse. Contact force is governed by Newton’s Laws. Contact force is responsible for most of the interactions we experience in the daily life. Pushing a car up the hill, writing your name with a pen or picking up a textbook from the table are all examples of contact force and they are also examples of continuous force. On the other hand, hammering a nail, kicking a ball etc are examples of impulse or momentary force.
Types of contact force:
Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. Friction is the reason why your car comes to a standstill if you don’t press the accelerator. The frictional force is opposing the rotation of the wheels of your car. Therefore if you leave the accelerator, the friction slowly removes all the force from the car and when it has removed the last bit of force, the car comes to a standstill. Another example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion causing it to stop sliding after a finite distance. Friction is a type of contact force only.
Applied Force: Force which is applied to an object by another object. A person pushing a barrel is an example of applied force. When the person pushes the barrel then there is an applied force acting upon the barrel. The applied force is the force exerted on the barrel by the person and it responsible for the motion of the barrel. Applied force may be contact force as well as non – contact force.
Normal Force: The normal force is also called Support force. The normal force is the support force exerted upon an object that is in contact with another fixed or stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. The solid ground provides the normal force for all of us live. The normal force is proportional to the weight of the body. Larger the body larger the normal force. If a very high weight is kept on a table and it cannot provide a normal force that large, then it breaks.