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 velocity of the input and TB and ωB are. Energy can be converted between different forms. Let's start with a different example though, to understand the relation between power and. 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.
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. 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. The amount of kinetic energy KE possessed by a moving object is dependent upon mass and speed.
Work, Energy, and Power
In other words, power is a measure of how quickly work can be done. One common unit of energy is the kilowatt-hour kWh.
- Work, Power, and Energy
- Mechanics: Work, Energy and Power
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: When hydrogen combines with oxygen to form water, heat is released as well. A fire is oxygen combining with other substances; this also produces heat.
Mixing mentos and coke produces foam whose mechanical properties can be exploited as in a MythBuster's Christmas machine.
Work, Energy, and Power
One stick of dynamite produces about a Megajoule. When an atom fissions it releases various particles and a little bit of heat. This energy was stored when the atom was created in the depths of a nova, an exploding star. Although the heat from each fission is miniscule, when the released particles trigger a cascade of fissioning atoms, the total energy can be enormous; as evidenced by the destruction wrought by an atomic weapon.
The heat from splitting one Uranium atom is 6.