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- W993880695 abstract "This chapter defines seven different units: force, weight, work, energy, power, pressure, and heat. A force is a push or pull exerted on a body. If an unbalanced force acts on a body, the body accelerates in the direction of the force. Conversely, if a body is accelerating, there must be an unbalanced force acting on it in the direction of the acceleration. The unbalanced force acting on a body is proportional to the product of the mass and of the acceleration produced by the unbalanced force. The mass m of a body refers to its inertia, and the weight w of a body is the pull or force due to gravity acting on the body which varies with location. (Inertia is the tendency of matter to remain at rest if at rest, or, if moving, to keep moving in the same direction, unless affected by some outside force.) Weight w is a force with a direction approximately toward the center of the earth. A force does work on a body when it acts against a resisting force to produce motion in the body. The energy of a body is its ability to do work. As the energy of a body is measured in terms of the work it can do, it has the same units as work. Power is the time rate of doing work. Average power = (work done)/(time taken to do this work) = force applied × velocity of body to which force is applied, where the velocity of the body is in the direction of the applied force. Pressure or p is a force per unit area." @default.
- W993880695 created "2016-06-24" @default.
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- W993880695 date "2005-01-01" @default.
- W993880695 modified "2023-09-23" @default.
- W993880695 title "Definitions of Physical Units and the International System" @default.
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- W993880695 doi "https://doi.org/10.1016/b978-012409751-3/50002-5" @default.
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