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What is work in physics?
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Sep 12, 2022 · OpenStax. Learning Objectives. Represent the work done by any force. Evaluate the work done for various forces. In physics, work represents a type of energy. Work is done when a force acts on something that undergoes a displacement from one position to another.
The Work–Energy Theorem. In physics, the term work has a very specific definition. Work is application of force, f f, to move an object over a distance, d, in the direction that the force is applied. Work, W, is described by the equation
The formula to find the work done by a particular force on an object is W equals F d cosine theta. W refers to the work done by the force F. In other words, W is telling you the amount of energy that the force F is giving to the object.
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- Why does one need a cos and theta when we can easily get the work by multiplying F and displacement ...Imagine that your F is at and angle starting at the origin and pointing somewhere between the x and y axis and you distance is along the x axis. To...
- Hi, i'm unclear about why Wnet=0 indicates that an object is maintained at constant. Could someone p..... the condition is that if the object is moving at a constant speed/velocity then the net work will be zero is TRUE. this is bcoz when u move at a...
- Hi, Just trying to understand Kinetic energy. If a mass travels at a constant velocity in one direct...Wow thats a great question.... How to figure out the answer? First thing that comes to mind is that energy is not a vector. This means that, whatev...
- What is the exact meaning of 'NET' Force and 'NET' Work?'Net' is used as opposed to 'Gross' because in some systems you get work back. Depending on your sign convention, negative work might be work retur...
- I don't understand 2 things: 1) What are the conditions for when this formula is valid? 2) How does ...Positive work is done on the object by the lifter, but negative work is done on the object by gravity. Therefore, the net work done on the object i...
- Gravitational Potential Energy does negative work right? So why isn't it taking away energy from an ...To calculate Grav. potential energy we use Ep = -G (m1m2/r). In order to have 0 grav. potential energy, the denominator, r, would need to be really...
- why is the cosine theta needed in some cases, and not in other cases? I noticed that cosine theta wa...Cosine theta is applied in every case of "work" because it determines whether the system energy is positive, negative, or 0 (neutral). After that t...
- Where does 1/2 come from?If you mean the 1/2 from mv²/2 , its a factor that appears when you calculate W = ∫F.ds = m.∫a.ds = m∫(dv/dt).ds = m∫dv.(ds/dt) = m∫v.dv = mv²/2
- Why do we need theta when we are finding work as by multiplying force and displacement we can easily...You can't simply multiply force and displacement unless the force is parallel to the displacement. You need the component of the force that is para...
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Find the direction of the force vector and the direction of motion. To start, it's important to first be able to identify both the direction the object is moving in and the direction from which force is being applied. Keep in mind that objects don't always move in line with the force being applied to them — for instance, if you pull a small wagon by its handle, you're applying a diagonal ...Find the displacement of your object. The first variable we need for the work formula, D, or displacement, is usually easy to find. Displacement is simply the distance that the force has caused the object to move from its starting position. In academic problems, this information is usually either given to or is possible to deduce from other information in the problem. In the real world, all ...Find the force on the object. Next, find the magnitude of the force being used to move the object. This is a measure of the "strength" of the force — the bigger its magnitude, the harder it pushes the object and the quicker it accelerates. If the force's magnitude isn't provided, it can be derived from the mass and acceleration of the moving (assuming that there aren't other conflicting ...Multiply Force × Distance. Once you know the magnitude of the force acting on your object and the distance it's been moved, the rest is easy. Simply multiply these two values by each other to get your value for work.[5] X Research source It's time to solve our example problem. With a value for force of 0.35 Newtons and a value for displacement of 2 meters (6.6 ft), our answer is a single ...Label your answer in joules. In physics, values for work (and several other quantities) are almost always given in a unit of measurement called joules. One joule is defined as one newton of force exerted over one meter, or, in other words, one newton × meter. This makes sense — since you're multiplying distance times force, it's logical that the answer that you get would have a unit of ...Work out as many problems as you can, this will ensure a thorough understanding. Thanks Helpful 5 Not Helpful 0If you succeed in solving a problem, smile and pat yourself on the back! Thanks Helpful 4 Not Helpful 0Keep practicing, and try again if you don't succeed at first. Thanks Helpful 1 Not Helpful 1- 273K
The standard unit used to measure energy and work done in physics is the joule, which has the symbol J. In mechanics, 1 joule is the energy transferred when a force of 1 Newton is applied to an object and moves it through a distance of 1 meter.
- in the numerical for how long do i have to push a heavy box......, further down it is given that wor...To calculate the work done one has to estimate the area under the force vs. position graph. To do so for the initial displacement of 30 m, one has...
- what is chemical potential energy?Chemical potential energy is the amount of potential energy tied up in a substance. The term is a little ambiguous because it can refer to the amou...
- "However, remember that our bodies are about 25% efficient at transferring stored energy from food i...If you use up 100% of your energy, you are getting only 25% of the work done. That means you have only 25% efficiency. 100 is 4x25. That is why, th...
- Doesn't it make more sense to say that because of our body's 25% efficiency the available energy for...same and you can even say like human body is wasting 75% of its energy while working which one is fit to your taste is surely up to you!
- `One frequent source of confusion people have with the concept of work comes about when thinking abo...The key point here is the difference between lifting the weight and holding the weight. While you are lifting the weight from the ground to over yo...
- "W=(50kg)(9.81m/s2)(0.5m)=245.25J" in this equation, should't the acceleration due to gravity be neg...kinetic energy
- If we take friction into account, is the force we use in the work equation with or without the frict...Friction is just another force on the object. There's the work done by the moving force, and then there's work done by friction, and you have to ne...
In physics, work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on something that undergoes a displacement from one position to another. Forces can vary as a function of position, and displacements can be along various paths between two points.
In summary, work is done when a force acts upon an object to cause a displacement. Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.
