name all types of friction and also define them ..??
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Answers
Answer:
When fluid layers are moving relative to each other, a type of friction occurs which is known as ‘fluid friction’. The internal resistance to the flow of fluids is termed ‘viscosity’; in simple terms, the viscosity is nothing but ‘thickness’ of a fluid.Sliding friction’ is the frictional force between two surfaces that are rubbing against each other. It’s a very easy and common concept. It’s hard to find a perfectly smooth surface in the real life, therefore when an object slides on any surface, it undergoes a backward force because of the relative motion between the two adjacent surfaces. It always acts against the motion. For a static situation, the applied force that tries to slide the object is always equal to the force of friction acting on the object. There comes a certain moment that the object starts moving in the direction of the external force. This happens when we gradually increase the applied force. The force of friction that acts against the motion remains constant.Rolling friction’ is the force that resists motion when an object rolls on a surface. Technically it’s not friction; its ‘rolling resistance’ since when a body rolls perfectly upon a surface, on paper, there is no sliding friction between that object and surface. But due to elastic properties in real life, both the bodies and the surface experience deformations due to contact between the bodies. Since the surface of contact is very small in real life hence the net normal force is also small and it is not enough like the static friction to prevent a body from sliding and keep it stationary and static friction increases with the increase in the external force; therefore rolling friction is usually less than the static.
ANSWER
Friction has two main types:
1).Static friction
2).Dynamic friction
Static Friction
It is the friction between two surface which are at rest or there is no relative motion between them.
Example= Pushing on a wall.
Dynamic Friction
This is the friction between two surface, which have relative motion between them(i.e, one of the surface is in motion).
Example=Friction between road surface and tyre of the car which is in motion.
Type of Dynamic friction:
1). Sliding friction:
Friction between two surface such that one of the surface is sliding over other.
Example= Rectangular block sliding over the floor.
2). Rolling Friction
One of the surface would be rolling over other.
Example= Ball rolling over the floor.
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