## Multimedia presentations

January 5th, 2012

## Rectilinear uniform motion

January 5th, 2012

Given that the trajectory of a material point (MP) motion is a straight line, the motion is called “a rectilinear motion”. The rectilinear motion can be described by the one-dimensional coordinate system. Let us suppose that at time $0$ s MP was in the beginning of motion, at time $t_0$ s MP was at the point with coordinate $x_0$, and at time $t$ MP was at the point with coordinate $x$.

Then the position of the MP at time $t_0$ is characterized by radius – vector $\vec r_0$ , MP position at time $t$ is characterized by the radius – vector $\vec r$ (Fig. 1).

## The main task of mechanics

January 3rd, 2012

The main task of mechanics consists of a definition of mathematical kind of dependence of the body position from time: The solution of the task is possible with a definition of the frame of reference, which consists of a body of reference with associated coordinate system, and of an

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## Bernoulli’s principle

January 2nd, 2012

The law of conservation of mechanical energy for liquids and gases is a special kind formulated by Bernoulli. Let’s consider the conclusion of the law on the example of an ideal incompressible fluid. The ideal liquid is such liquid in which the internal friction can be ignored,  Read the rest of this entry »

## Mechanical energy

January 1st, 2012

The energy is one of the concepts in physics, for which there exists no any definition, ie, undefined concept. We can feel the energy released  in the form of heat when through a conductor pass a current , we can estimate the reserve of potential energy of the ball above the Earth’s surface according to the magnitude of its deformation after impact on the surface, etc.

Yet energy concept is an intuitive concept. Read the rest of this entry »

## Solution of task using graph

December 29th, 2011

The process of solving the problem is a type of mental activity, so to successfully meet the challenges need to be clear about the logical relationships between the physical quantities. To build a system of logical connections let’s consider a mathematical object that has the name of the graph.

December 26th, 2011

The dynamics equations are based on the determination of the causes of body movements and their impact on the type of movement. The dynamic equations are the solution to the basic problems of mechanics, but these solutions are expressed using dynamic variables: force, energy, momentum.

## Fiber-optic current sensor

December 26th, 2011

In the electric power industry and the electrochemical industry is the measurement problem of strong currents of a few hundred kA.The company  ABB  has developed for this purpose the Fiber-Optic Current Sensor (FOCS).

## Kinematics: knowledge presentation

December 11th, 2011

This headline is entirely devoted to solving problems. It contains two categories – the training examples for testing for control of the most common relationships between the physical quantities, as well as a workshop on the task solutions.  Read the rest of this entry »