Physics: a general course. Volume I : Mechanics Molecular by Savelyev I.V.

By Savelyev I.V.

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Friction between the surfaces of two solids in the absence of any •• intermediate layer, for instance, a lubricant between them, is called dry. solid and a fluid, and also between the •• layers of a fluid, is called viscous (or liquid). Two kinds of dry friction are distinguished: sliding and rolling. Forces of friction are directed along a tangent to the surfaces (or layers) in contact so that they resist the relative displacement of these surfaces (layers). If, for example, two layers of a liquid slide over each other with different velocities, then the force applied to the faster layer is directed oppositely to the direction of motion, while the force acting on the slower layer is directed along its motion.

When a body is at rest relative to the Earth's surface, the force P is balanced by the reaction** F r of the suspension or support preventing falling of the body (F r = - P). According to Newton's third law, the body in this case acts on the • Owing to the non-inertial nature of a reference frame associated with the Earth, the force of gravity will differ somewhat from the force with which a body is attracted to the Earth. This will be treated in greater detail in Sec. 2 . •• Reactions are forces with which a given body is acted upon by bodies l'estrieting its motion.

However, the work done to move the particle from point1 to point2 along any other trajectory (including one not passing through point 0) will be the same. Hence, the sum A 10 A 02 can be written simply in the form Au. As a result, we get Eq. 26). We can thus use the function E p to determine the work done on a particle by conservative forces along any path beginning at arbitrary point 1 and terminating at arbitrary point 2. Assume that only conservative forces act on the particle. Consequently, the work done on the particle along path 1-2 can be represented in the form of Eq.

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