### WORK, ENERGY AND POWER

In physics, power is the rate of doing work or transferring heat, the amount of energy transferred .. The similar relationship is obtained for rotating systems, where TA and ωA are the torque and angular The peak power is simply defined by. This is where power comes in. It's simply a calculation of how many units of energy you are using per unit of time. Depending on the situation. Definitions. Work can be defined as transfer of energy. In physics we say that work is done on an object when you transfer energy to that object. If one object.

The more difficult problems are color-coded as blue problems.

Work Work results when a force acts upon an object to cause a displacement or a motion or, in some instances, to hinder a motion. Three variables are of importance in this definition - force, displacement, and the extent to which the force causes or hinders the displacement. Each of these three variables find their way into the equation for work.

The most complicated part of the work equation and work calculations is the meaning of the angle theta in the above equation. The angle is not just any stated angle in the problem; it is the angle between the F and the d vectors.

In solving work problems, one must always be aware of this definition - theta is the angle between the force and the displacement which it causes.

## Mechanics: Work, Energy and Power

If the force is in the same direction as the displacement, then the angle is 0 degrees. If the force is in the opposite direction as the displacement, then the angle is degrees.

If the force is up and the displacement is to the right, then the angle is 90 degrees. This is summarized in the graphic below. Power Power is defined as the rate at which work is done upon an object.

Like all rate quantities, power is a time-based quantity. Power is related to how fast a job is done.

### Work, Energy and Power

Two identical jobs or tasks can be done at different rates - one slowly or and one rapidly. The work is the same in each case since they are identical jobs but the power is different. The equation for power shows the importance of time: Special attention should be taken so as not to confuse the unit Watt, abbreviated W, with the quantity work, also abbreviated by the letter W.

Combining the equations for power and work can lead to a second equation for power. A few of the problems in this set of problems will utilize this derived equation for power. Mechanical, Kinetic and Potential Energies There are two forms of mechanical energy - potential energy and kinetic energy.

Potential energy is the stored energy of position. In this set of problems, we will be most concerned with the stored energy due to the vertical position of an object within Earth's gravitational field. Kinetic energy is defined as the energy possessed by an object due to its motion. An object must be moving to possess kinetic energy.

**Hindi: Energy Work Power**

The amount of kinetic energy KE possessed by a moving object is dependent upon mass and speed. The total mechanical energy possessed by an object is the sum of its kinetic and potential energies. Chemical Energy --Chemical energy is a form of potential energy related to the breaking and forming of chemical bonds.

It is stored in food, fuels and batteries, and is released as other forms of energy during chemical reactions. Mechanical Energy -- Energy of the moving parts of a machine.

Also refers to movements in humans Heat Energy -- a form of energy that is transferred by a difference in temperature What is Power Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done.

One common unit of energy is the kilowatt-hour kWh. If we are using one kW of power, a kWh of energy will last one hour. Power's unit of measurement in the English system is the horsepower, which is equivalent to How much work is done? Please enter your answer in the space provided: How much power is used? An example of Kinetic Energy would be: An example of Potential Energy would be: