Work | physics | vlozodkaz.info
Three variables are of importance in this definition - force, displacement, and The work is the same in each case (since they are identical jobs) but the power is different. There is a relationship between work and total mechanical energy. Work: Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an Energy has a precise meaning in physics that does not always correspond to everyday language, and yet relation to power . of daily energy management at work: Relations to employee well-being and job and job characteristics between the subgroups were investigated by means .
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. 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. 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.
Industrial relations - Wikipedia
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. I have a block of mass m. I have a block of mass m and it starts at rest. And then I apply force.
Let's say I apply a force, F, for a distance of, I think, you can guess what the distance I'm going to apply it is, for a distance of d. So I'm pushing on this block with a force of F for a distance of d.
And what I want to figure out is-- well, we know what the work is. I mean, by definition, work is equal to this force times this distance that I'm applying the block-- that I'm pushing the block.
But what is the velocity going to be of this block over here? It's going to be something somewhat faster. Because force isn't-- and I'm assuming that this is frictionless on here. So force isn't just moving the block with a constant velocity, force is equal to mass times acceleration. So I'm actually going to be accelerating the block. So even though it's stationary here, by the time we get to this point over here, that block is going to have some velocity.
We don't know what it is because we're using all variables, we're not using numbers. But let's figure out what it is in terms of v. So if you remember your kinematics equations, and if you don't, you might want to go back. Or if you've never seen the videos, there's a whole set of videos on projectile motion and kinematics.
But we figured out that when we're accelerating an object over a distance, that the final velocity-- let me change colors just for variety-- the final velocity squared is equal to the initial velocity squared plus 2 times the acceleration times the distance. And we proved this back then, so I won't redo it now. But in this situation, what's the initial velocity? Well the initial velocity was 0. So the equation becomes vf squared is equal to 2 times the acceleration times the distance.
And then, we could rewrite the acceleration in terms of, what? The force and the mass, right? So what is the acceleration?
Well F equals ma. Or, acceleration is equal to force divided by you mass. So we get vf squared is equal to 2 times the force divided by the mass times the distance.
Introduction to work and energy
And then we could take the square root of both sides if we want, and we get the final velocity of this block, at this point, is going to be equal to the square root of 2 times force times distance divided by mass. And so that's how we could figure it out. And there's something interesting going on here. There's something interesting in what we did just now.
Do you see something that looks a little bit like work? You have this force times distance expression right here. Consistency, on the other hand, is slow but sure--if you execute your tasks effectively and on time, day after day, eventually people will come to rely on you. The same is true when you execute a consistent style of leadership, setting consistent expectations with your employees and giving consistent rewards for good work.
People will come to rely on your behavior and expect you to be a consistent performer. That consistency is vital for building influence.
- Mechanics: Work, Energy and Power
Otherwise, you'll have an air of unpredictability about you, and people won't know whether to trust or impugn your suggestions. If you're consistently motivated by the same principles, people will trust that your ideas are solid and reliable as an extension, and that will make it easier to get people on your side.
Consistency is especially important when you're in a lower position, since it demonstrates a degree of dedication. Be Assertive, Not Aggressive. Being assertive is the only way to get your ideas noticed, especially when you're competing with others for visibility, such as in a meeting. However, there's a difference between being assertive and being aggressive. You'll need to present your thoughts and ideas with a high degree of confidence, indicating your convictions, but any excessive degree of confidence could be mistaken for needless arrogance, which will compromise your perceived authority.
Tread carefully, especially when you're unfamiliar with your audience or if you're presenting your thoughts on an area outside of your expertise.
This assertiveness should extend as a general quality to all your interactions, regardless of whether you're speaking to employees above, below, or at your level, and regardless of the conversation format. Flexibility is also important. While this may seem like it conflicts with the need to be assertive--after all, it's difficult to assert yourself fully if you're open to changing your opinion--being too stringent or adamant in your beliefs will work against you.
In this case, people will come to see you as a stubborn, immovable monolith, incapable of believing in anyone other than yourself.Work, Energy, and Power: Crash Course Physics #9
This can decrease the respect people have for you and compromise your overall influence. Instead, work actively to show your flexibility while holding firm on your beliefs. Negotiations and compromises are often the best ways to do this. Stay rigid in your beliefs when someone contradicts you, but work with them to find a mutually acceptable solution.