Физика -physics

Электрокардиография – Electrocardiography (ECG or EKG from Greek: kardia, meaning heart) is a trans thoracic (across the thorax or chest) interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the surface of the skin and recorded by a device external to the body.^[1] The recording produced by this noninvasive procedure is termed an electrocardiogram (also ECG or EKG).

	Электротомография – Electromyography (EMG) is a technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyography, to produce a record called an electromyography. An electromyography detects the electrical potential generated by muscle cells when these cells are electrically or neurologically activated. The signals can be analyzed to detect medical abnormalities, activation level, and recruitment order or to analyze the biomechanics of human or animal movement.
	Куч – Force - In physics, a force is any influence that causes a free body to undergo a change in speed, a change in direction, or a change in shape. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e. to accelerate, or which can cause a flexible object to deform. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma. Can be formulated to state that an object with a constant mass will accelerate in proportion to the net force acting upon and in inverse proportion to its mass, an approximation which breaks down near the speed of light. Newton's original formulation is exact, and does not break down: this version states that the net force acting upon an object is equal to the rate at which its momentum changes.
	Масса- Weight - In most physics textbooks, weight is the name given to the force on an object due gravity. However, some books use an operational definition, defining the weight of a 1 object as the force measured by the operation of weighing it (that is, the force required to support it). Both definitions imply that weight is a force and that its value depends on tile local gravitational field. For example, an object with a mass of one kilogram will have weight of 9.8 Newton's on the surface of the Earth, about one-sixth as much on the Moon, and zero when floating freely far out in space away from all gravitational influence. The differences between the two definitions are discussed below. For example, they differ over the weight of an object in free fall, such as a falling apple or an astronaut in an orbiting spacecraft. In these cases, the operational definition implies the weight is zero, whereas the gravitational definition does not.