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3.3. Weight. Newton's Second Law

Lecture



Experience shows that by force   3.3.  Weight.  Newtons Second Law free body changes the speed of its translational motion, gaining acceleration   3.3.  Weight.  Newtons Second Law . In this case, the acceleration of the body is directly proportional to the force causing it and coincides with it in the direction:

  3.3.  Weight.  Newtons Second Law

Where   3.3.  Weight.  Newtons Second Law - positive coefficient of proportionality, constant for each specific body.

The magnitude of the acceleration acquired by force   3.3.  Weight.  Newtons Second Law , depends on the body, on which the force acts. Since it is more difficult for large bodies to impart acceleration than for small ones, it is customary to express proportionality between force and acceleration in the following form:

  3.3.  Weight.  Newtons Second Law (3.2)

The proportionality coefficient m depends on the subject. Its value increases with increasing body size, if they are homogeneous. The constant m is called body mass. Mass is a measure of the inertia of the body in the outward motion. The smaller the inertia of the body, the greater the acceleration it must acquire under the action of a particular force. Thus, Newton's second law can be formulated as follows: the acceleration of the body is directly proportional to the force causing it, coincides with it in direction and inversely proportional to the mass of the body.


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Physical foundations of mechanics

Terms: Physical foundations of mechanics