Work and, energy, power are fundamental concepts of physics. Object to be displaced. We define the ability to do work as energy. Power is work done per unit time. This article discusses work, energy and power in detail. Work and energy are two sides of a coin as they are interconnected. Work refers to the displacement of an object when the force (push or pull) is applied to it. At the same time, energy is the ability to do work. It exists in various forms those are potential, kinetic, chemical, thermal, nuclear and electrical energy. Power is work done per unit time. Studying the workforce power to gain knowledge and get high marks in the exam is very important.
Work Energy and Power
The force must be exerted, and there must be motion or displacement in the direction of the force. When work is done by a force acting on an object is equal to the magnitude of the force, and its multiplied by the distance it moves in the direction of the force. Work has only magnitude and no direction. Therefore, work is a scalar quantity.
For example, when a person climbs a mountain, work is done because he is moving against the force of gravity while climbing the mountain. So, the work depends on two factors. They are:
- The magnitude of the force.
- The direction in which a body moves due to an applied force.
Work, energy and power notes
Therefore, work is measured by the displacement of a body and its force along with the direction of the force. It is referred to as a scalar quantity, and the SI unit of work is the joule.The equation thus stands as:
Work = F * S.
If a body is displaced by S, a force F acts on it.
Work W = FS Cos (Angle between displacement and force).
The point to note here is that a force is said to do work when it produces the motion of an object. Here is one example, a man tries to move a wall, but the wall does not move, so the work done by the man is zero because no displacement is produced. But he loses strength as he strains and tires his muscles in his effort to push the wall. Hence, it shows that Work is not necessarily done whenever a force is applied to an object. When Work is done only when the applied force can change the direction of the object or move it.
What is Energy
Energy is the ability that allows a person to do work. Simply put, energy is the ability to do work. It is scalar in magnitude and has only magnitude and direction. Energy is neither created nor destroyed. It only changes in its form. Energy is found in many things, and energy has many forms. The most important types of energy are kinetic energy and potential energy. Kinetic energy refers to the energy produced by the motion or motion of a body. It represents the work required to accelerate a mass separated from its velocity. If a body accelerates after receiving energy, it maintains kinetic energy until its velocity changes.
1. Whenever the mass of a body double, its kinetic energy doubles.
2. If the body mass is halved, the kinetic energy is also halved.
3. The kinetic energy of a mass quadruples when the velocity doubles.
Types of Energy
- Mechanical power.
- Mechanical wave energy.
- Chemical energy.
- Electric power.
- Magnetic force.
- Luminous power.
- Nuclear power.
- Ionization energy.
- Resilience.
- Gravitational force.
- Heat energy.
What is Power
Work energy, or simply energy, is a physical concept that can have many meanings depending on the context and available details. Power can be defined as the rate of doing work. Energy is the energy consumed per unit of time. It is a scalar quantity because it has no direction. The SI unit of energy is joules/second and is called the watt. A watt is the energy required to do one joule of work per second.
The formula of Power
As discussed, power is the rate at which work is done. Hence, it can be calculated by dividing the work done by the time. The formula for power is given below.
P=w/t
Conclusion
Integral dW= integral m v dv = 1/2 m v^2 = kinetic energy . You notice here energy is the capacity of doing work, work-related force action and energy per unit of time is the power. This fact shows that energy is the source of action. The capacity to do work.
Work
Work is the application of energy to a distance. An excellent example of work is lifting a weight off the ground and placing it on a shelf. The force is equal to the object’s weight, and the distance is equal to the height of the shelf (W= Fxd).
Energy:
We define the ability to do work as energy. The simplest case of mechanical work is when an object is at rest, and we force it to move. For an object of mass m, moving with a velocity of magnitude v, this force can be calculated from the formula E= 1/2 mv^2.
Power
Power is work done per unit time. In simple words, energy measures how quickly work can be done. Unit of energy is watt = 1 joule/ 1 second.
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