Difference between force , work and energy
Answers
Answer:
Force is the strength of a push or a pull on an object. ... A joule is defined as the amount of work done by a force of 1 N acting through a distance of 1 m. Power is the rate at which work is done (or in general, at which energy is transferred).
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Explanation:
Force
If you're a taking classical physics, simply stated, a force is a push or a pull of some sort. But there is one other very important thing to understand about Force. A true Force is always an interaction (at least from a classical perspective). That means that forces always come in pairs. This is stated in Newton's Third Law (equal and opposite forces). Every action must have a reaction. This is required for all true forces. Another consequence of this is that force is a vector, meaning it has a magnitude and a direction. The action and reaction will always be opposite in direction.
A lot of people will say: F=ma. This is true. However, it is important to keep in mind that this definition is a calculational tool. It is more precise to say the Sum of all forces=ma. The point is that ma is not a force. Forces are things like weight, tension, normal, friction, gravity, electrostatic, magnetic, and various other applied forces. The sum of forces on an object equals the produce of its mass times its acceleration.
It is important to keep in mind that the force is on the object that accelerates. Another way to state this is that objects cannot accelerate themselves. You cannot push yourself back (or forwards). But if you push a heavy object like a desk forwards, then the desk can push you back.
Work
Work is the product of a component of a force on an object times the displacement of the object while the force is being exerted in the direction of displacement. Work is a scalar. Work is done on something or by something. Another way of understanding Work is that Work is a change in energy via a force. (There are other ways of changing energy, such a through thermal contact). The point is that work changes the energy of something and the change is through application of a force. Work can increase or decrease energy. In most classical scenarios, work will change either the kinetic or potential energy.
Work is usually defined as W=F*delta(x) where the * is the dot product.
It is also important to remember that you can define W=delta(K) or W=-delat(U) where K and U are kinetic and potential energy (respectively).
Energy
There are many kinds of energy. There are two important things to know.
Energy is the ability to do work. It doesn't mean work is being done, but that work can be done. (So you can see there is an intimate relationship between work and energy).
Energy is conserved. That means the total amount of energy is always constant. If the energy is a system changes somehow, that means some work was done in order to move the energy from one system to another.
Energy is also a scalar (given that Work is a scalar).