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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Learn about the different types of friction, such as dry, fluid, lubricated, skin and internal, and how they affect mechanical energy, wear, and performance.
Statics is the branch of mechanics that studies the equilibrium of forces and torques on a system. Learn about the concepts of force, moment, equilibrium, moment of inertia, and their applications in solids and fluids.
Stiction is the force needed to overcome static friction and start motion of stationary objects in contact. Learn how stiction affects automobiles, engineering and surface micromachining, and see related terms and references.
Learn about the three physical laws that describe the relationship between the motion of an object and the forces acting on it. Newton's first law, also known as the law of inertia, states that a body remains at rest or in motion at a constant speed in a straight line unless acted upon by a force.
Force is an influence that can cause an object to change its velocity unless counterbalanced by other forces. Learn about the concept of force in classical and modern physics, the different types of forces, and the historical development of the force concept from ancient to modern times.
Coulomb damping is a type of constant mechanical damping that absorbs energy via sliding friction. Learn about its history, modes, illustration, theory and examples of Coulomb damping in machinery and structures.
Electrostatic machines are typically used in science classrooms to safely demonstrate electrical forces and high voltage phenomena. The elevated potential differences achieved have been also used for a variety of practical applications, such as operating X-ray tubes, particle accelerators, spectroscopy, medical applications, sterilization of food, and nuclear physics experiments.
Stress is a physical quantity that describes forces during deformation of a material. It has SI units of pascal (Pa) and can be normal, shear, or isotropic. Learn more about stress in continuum mechanics, its history, causes and effects, and analysis methods.