Guide

1

First, you need to calculate the potential energy of the body, it is called the rest energy.It is calculated by the formula: P = m * g * h (product weight, height and acceleration of gravity), where m - mass of the body, g - gravitational acceleration equal to 9,8N / m, h - the height to which the body is raisedabove ground.If its distance from the surface of the Earth, as a fulcrum, is 0, then the potential energy is also equal to 0. Thus, if the body is suspended above the surface at a certain height, it has a positive potential energy.If it is below the surface, that is, under the earth, its potential energy is negative (in fact on his climb to an altitude of zero will require additional energy costs).

2

Kinetic - the energy of motion of the body, that is, i
t is only moving objects (with speed).The following calculation formula: E = m * V ^ 2/2 (the product of the body weight by the square of its velocity divided by 2), where m - the weight, V - speed that has a body at the time of calculation.If the body is fixedly secured to the suspension or it rests on the support, the kinetic energy is equal to 0, as the speed is absent.The greater the speed and weight, the greater its kinetic energy.

3

To find the total energy necessary to combine the kinetic and potential.The formula is: Ep = P + E = m * g * h + m * V ^ 2/2.Typically, the physical body is at rest, but removed from the Earth, so it has only potential energy, kinetic equal to 0 (for example, suspended load).Moving on the Earth's surface the body has only kinetic energy, the potential is equal to 0 (for example, riding a car).But if the body is in flight, the value of the two forms of energy - nonzero.

Helpful Hint

energy - a scalar physical quantity that describes the various forms of motion of matter, as well as its transition from one form to another.For a closed mechanical system operates energy conservation.The formula for calculating the total value of it is just one of the characteristics of that law.The unit of measure of energy - joule.J. = kg * m ^ 2 * c ^ 2 (kilograms per meter squared per second squared) = Nm (Newton meters).