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Friction : Introduction
Friction is an electromagnetic force. No surface is perfect smooth surface hence there will be always friction force between two moving surfaces. To understand this better let’s take below example –
Contact surface between block and surface will look like above if we zoom in highlighted area. Now when this block will move in either direction, there will a force which will act in opposite direction of movement of object because of rough structure of contact surface.
There are two types of force are acting on this block –
One is normal reaction “N” and other is friction force “f” acting in opposite direction of movement. Resultant force will be there as shown in figure.
Friction is always perpendicular to the normal reaction.
Where lambda is called angle of friction.
Causes of friction
- Inter-blocking of projected parts of one surface into the other surface.
- Due to temporary bonding between the molecules of the object and the contact surface.
Where is the coefficient of the friction, N is normal reaction at the same contact.
It is the constant of the two contact surfaces. It depends on only two factors –
- Roughness of the surfaces.
- Material of the object and contact surface.
Types of Friction
- Static Friction
- Kinetic Friction
We’ll read about these specific types and will solve few problems to understand this phenomenon better in next chapters. You’ll also have practice problems and quizzes on this through which you can check how much have you learned. Also you can send us new questions which you weren’t able to solve. Our experts will provide you the suitable solutions.
Please write us at “firstname.lastname@example.org” for any kind of query. Happy Reading.