Нужно перевести grammar: gerundwork and energymany of the words we use in our everyday speech, assume a more exactmeaning in the language of science. let is take the word "work". besides its being aword in common use, it is a scientific term that has naturally grown out of humanexperience.when we are studying or teaching we say that we are working. studying orteaching may be very hard, but no physicist will ever call it work. work is done whena force moves something.in physics the term "work" is defined as a product of force and displacement inthe direction of force. for example, one can do work by drawing water from wells.pushing something along the floor against friction also means doing work.work and energy are closely connected. the capacity for doing work is calledenergy. it can exist in many forms such as kinetic, potential, electrical, etc. energy ismeasured in the same units as work and like work is a scalar quantity.in mechanics we are interested in kinetic as well as in potential energy.the kinetic energy of a body is the energy it possesses because of its speed. anairplane travelling at a speed of, say, 500 km/hr, is able to rise a few metres higherwithout using any power from the motors. thus, any moving body is able to do worksimply because it is moving.
