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# Difference Between Static And Dynamic Friction Pdf

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## Static and kinetic friction – what exactly is the difference?

The tangential component of the force of interaction between two surfaces in contact is called friction. It leads to resistance against movement between the surfaces and can cause mechanical deformation and heating. Kinetic friction is the retarding force between two objects in contact that are moving against each other.

It depends on the type of the contacting surfaces. Kinetic friction is high for rough and dry surfaces and low for wet and smooth ones. The force necessary to induce motion i. Kinetic friction remains constant between two surfaces, regardless of the relative speed of their movement. The coefficient of kinetic friction has a constant value for each pair of contacting surfaces materials.

For example it is 0. The force that has to be overcome in order to get something to move is called static friction. This is the force that prevents an object, placed on a sloped surface, from sliding. At solid surfaces, the static friction occurs as a consequence of the surface roughness of the objects in contact. Its value depends on the type of the contacting surfaces. It is higher for rough and dry surfaces and lower for wet and smooth ones.

The coefficient of static friction has a constant value for each pair of contacting surfaces materials. In order to make a stationary object move, we have to overcome the static friction force by an applied force. When a small force is applied to a nonmoving object, the static friction is of equal magnitude, but in the opposite direction to the applied force. When the force is being increased, at a certain point it reaches the maximum static friction value.

At that point, the static friction is overcome and the object starts to move. Static F riction : The force that has to be overcome in order to get something to move is called static friction. K inetic F riction : The force necessary to induce motion is always bigger than the one necessary to continue the motion.

So the kinetic friction coefficient is smaller than the static friction one. Static F riction : The coefficient of static friction exceeds the one of kinetic friction. Cite Dr. July 16, Name required. Email required. Please note: comment moderation is enabled and may delay your comment.

There is no need to resubmit your comment. Notify me of followup comments via e-mail. Written by : Dr. Introductory Physics I: Elementary Mechanics. Morrisville: Lulu Press. Fundamentals of Physics Textbook. Hoboken: Wiley. Moscow: Mir. User assumes all risk of use, damage, or injury. You agree that we have no liability for any damages. What is Kinetic Friction? What is Static Friction? Summary of Kinetic and Static Friction: The tangential component of the force of interaction between two surfaces in contact is called friction.

The retarding force between two objects that are moving against each other is called kinetic friction. Friction depends on the type of the contacting surfaces.

It is high for rough and dry surfaces and low for wet and smooth ones. Author Recent Posts. Mariam has more than 10 years of professional experience in scientific research and environmental consultancy. She has worked within non-profit, profit, and academic environment, and consulted business clients and competent authorities. Her main professional interests are in the area of: Scientific research; Web content writing; Environmental consultancy.

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## Difference Between Kinetic Friction and Static Friction

The serious friction caused by the fluctuation of friction occurs when start-up and will reduce the positioning accuracy of the servo axes of high precision machine tools, the purpose of this paper is to study the friction fluctuation characteristics of friction coefficients between interfaces under different working conditions. HT and 45 materials were experimentally studied by friction and wear testing machine UMT-3, the variation of friction coefficient under different working conditions different start-up conditions, the variation of lubrication state area and different roughness were measured. The results show that the larger start-up acceleration shortens the pre-sliding time of the interface friction, makes the friction coefficient decrease faster, reduces the mixed lubrication area of the contact surface and makes the contact surface reach the stable lubrication state quickly. It can be concluded that the larger roughness surface will lead to the larger mixed lubrication area, the larger static friction coefficient and the larger drop between static and dynamic friction coefficient and easy to cause friction vibration. The results reveal the friction fluctuation rule of the metal interface during the different start-up process, which is of guiding significance to reveal the lubrication principle and mechanism of the mechanical interface. I thank Professor Gao and Associate Professor Li for providing experimental equipment, experimental platform and relevant experimental materials, as well as providing technical assistance in the whole process.

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When setting up or maintaining a conveyor belt, there are often issues due to friction. The friction between two bodies is never exactly the same when at rest and when moving. The force required to start a body sliding is greater than the force needed to keep it sliding.

Hierarchical structures are very common in nature, but only recently have they been systematically studied in materials science, in order to understand the specific effects they can have on the mechanical properties of various systems.

Static and Kinetic are the two categories in which friction is classified. The significant difference between static and dynamic friction is that static friction is the frictional force acting on a body that is resting. As against kinetic friction is the force of friction acting on a body that is in a relative motion. Thus, we can say, these two types of frictions are majorly differentiated on the basis that whether the force of friction is acting on the body at rest or in motion.

Skyles, Lane P.