Work and Power Difference in Tabular Form
| Criteria | Work | Power |
| Definition | The definition of work is the power you ... | Power is the energy you need to complete ... |
| Formula | Total Work Done (W) = Power (P) x Time ( ... | Power (P) = Total Work Done (W)/Time (t) |
| Measurement Unit (SI unit) | The standard unit of work is the Joule d ... | The standard unit of measurement of powe ... |
| Example | A person is said to do work if he/she is ... | A lamp needs the energy to light the bul ... |
What is the formula for power and work?
The quantity that has to do with the rate at which a certain amount of work is done is known as the power. The hiker has a greater power rating than the rock climber. Power is the rate at which work is done. It is the work/time ratio. Mathematically, it is computed using the following equation. Power = Work / time or P = W / t
What is the equation for work energy?
Work and Energy Equations. It is the resultant of the force applied (F) and the amount of displacement (d) and is articulated by the equationW = F.d. Power describes the rate at which work is done. It is articulated as. P = W/t. The energy or work is articulated in Newton-meter (Nm) or Joules or kg.m 2 /s 2. 1 Joule is defined as the amount of heat released when a force of 1 newton acts over ...
What is the relation between work and energy?
Transferring energy can be in the form of force. This amount of energy transferred by the force to move an object is called work or work done. Thus, the relation between Work and Energy is direct. That is, the difference in the Kinetic energy of an object is work done by an object.
What is the equation for power energy?
Power Equation. P = E/t: This formula is also called the mechanical power equation. Here E stands for energy in joule and t stands for time in seconds. This formula states that the consumption of energy per unit of time is called power. P = w/t. This is the most common and basic formula of power that we come to know about very early.
What is work power and energy?
Work is referred to as the process of energy that is transferred to an object's motion by applying force. It is generally represented as the product of displacement and force. Power is the amount of energy that is transferred in a unit of time. The SI unit of work is Joule (J). The SI unit of power is Watt (W).
How are work power and energy related?
Force exerted on an object over a distance does work. Work can increase energy, and energy can do work. Power is the rate at which work is done.
What's the formula for energy?
The formula that links energy and power is: Energy = Power x Time. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
What is work done formula?
To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
What is the SI unit for energy?
JouleJoule (J). This is the basic energy unit of the metric system, or in a later more comprehensive formulation, the International System of Units (SI). It is ultimately defined in terms of the meter, kilogram, and second.
What is the SI unit of work energy and power?
SI unit of work = joule (J) SI unit of energy = joule (J) SI unit of power = watt (W) Dimensional formula of work =ML2T−2.
What are the 3 formulas for work?
Work formula is used to compute work done, force or displacement in any problem....W= F × d × cos\theta.WIt is the work done by the force.FF is the force applied.dIt is the displacement caused by the force\thetaIt is the angle between the force vector and the displacement vector.
What is the unit for work?
jouleScientists use the joule to measure work. One joule is equal to the work done by a force of one newton to move an object one meter in the direction of the force.
What are the three formulas for power?
Power Formula is articulated as,P = E t.P = W t.P = V 2 R.
What is the work energy?
Work–energy principle. The principle of work and kinetic energy (also known as the work–energy principle) states that the work done by all forces acting on a particle (the work of the resultant force) equals the change in the kinetic energy of the particle.
Is energy equal to work?
Transferring energy can be in the form of force. This amount of energy transferred by the force to move an object is called work or work done. Thus, the relation between work and energy is direct i.e., the difference in the kinetic energy of an object is work done by an object.
What is power Class 9 work and energy?
The rate at which work is completed can be characterized as power. The amount of energy utilized per unit of time is referred to as power. It is a scalar quantity because it has no direction. Watt is the SI unit of power, which is defined as Joules per second.
How are energy and work related quizlet?
Energy is the ability to do work while work is the change in energy.
What is the relationship between work and power quizlet?
Work is how much force it takes to move an object in the same direction as the force. Power is how long it takes you to do the work.
How is power related to energy quizlet?
How is power related to energy? Power is related to energy by that it is the rate at which energy is transferred.
What is the energy theorem?
Work – energy theorem. 6. Conservative force. means work done by conservative force does not depends on path, depends only on initial and final position. 7. Non conservative force. means work done by non conservative force depends on path. 8. Potential energy.
What does change in P.E. mean?
Frictional force, viscous force, air resistance etc. 8. Potential energy. Potential energy of a system is always defined corresponding to a conservative internal force. Change in P.E. = – Work done by the internal conservative force on the system.
What is Work?
Thecomponent of the force in the motion 's directionmultipliedthe distance across which the force operates is the work done on a system by a constant force. When a force works on an item, causing it to move, it is said that work has been done on the thing. Work is made up of three main components: force, displacement, and causation.
SI Unit of Work
The Joule (J) is termed the SI Unit of work. It can simply be defined as the work done by a force of one Newton in moving an object a distance of one metre in the direction of the force.
Factors Affecting Work
Force is described as a push or a pull that may cause any massed object's velocity and acceleration to alter. The amount and direction of force are both vector quantities. If the force acting on an item is zero then no work is done.
What is Power and Energy?
To understand the relationship between Work, Power and Energy, we need to first be clear with the concepts of Power and Energy.
Relation of Work Power and Energy
The relationship of work with the concepts of Power and Energy is elaborated in detail below:
Things to Remember
Work can be defined as the transfer of the energy that happens when an object is moved across a distance by an external force, at least a portion of which is applied in the displacement direction.
Sample Questions
Ques. Using the Work-Energy Theorem, explain the relationship between work and energy. Derive its Formula as well. (5 Marks)
What is work energy?
Work and energy are the two sides of a coin as both are interconnected to each other. Work is referred to as the displacement of an object when a force (push or pull) is applied to it while energy is referred to as ...
What is the formula for kinetic energy?
While acceleration after the body gains energy, it maintains kinetic energy until its speed changes. The formula of kinetic energy is – 1/2mv2. Hence from the formula given above, we can state:
What is the unit of power?
Power can be defined as the rate of doing work. Power is the energy that is consumed per unit of time. It is present in scalar quantity as it does not have any direction. The SI unit of power is Joules/ second and is termed as Watt. Watt refers to the power needed to do one Joule of work in a second.
What happens to kinetic energy when mass is halved?
2. If the mass of a body is halved, then the kinetic energy is also halved.
What is the difference between work and energy?
Work is referred to as the displacement of an object when a force (push or pull) is applied to it while energy is referred to as the capacity to do the work. It exists in various forms like potential, kinetic, chemical, thermal, nuclear, electrical energy and so on. Power is the work done per unit of time.
What are the two types of energy?
Energy can be found in many things, and so there are many forms of energy. The most important types of energy are kinetic energy and potential energy . Kinetic energy refers to the energy of a body due to its movement or motion.
What is the capacity of a man that allows him to do work called?
Energy . The capacity of a man that allows him to do work is called energy . In simple words, energy is the ability to work. It is in scalar quantity and has only magnitude and no direction. energy can neither be created nor destroyed, it can only change in its form.
What is the difference between work and power?
Though the term work and power are interconnected, there is a vast difference between work and power. You cannot complete work without the help of power. You need the energy to complete a task, whereas people define energy as power. Since both work and power are a scalar quantity, students are often confused. ...
What is the definition of power?
Power. The scientific definition of power is the rate of doing work. Power is the energy you need to displace an object in a given time. You need the energy to stop a moving object, raise an object against gravity, or move an object having a certain velocity.
What is Work?
Most often, you use the term ‘work’ to express doing some task. It can be either reading a book or sitting at your work-station to complete a job on the computer. However, the scientific term work done is not related to the stationary task. Science defines work as a task done when a force acts upon a body that produces displacement in it. In simple words, work is not complete until and unless force is applied, which moves an object. The standard unit of work is the Joule denoted as (J). You can define one Joule of work done as the amount of work done when 1 Newton of force brings about a displacement of 1 meter in the direction of the applied force.
What are some interesting facts about power?
Fun Facts on Work and Power 1 If you are kicking a ball, your work done is positive. 2 If you are sitting in the classroom, listen to lectures, the work done is said to be zero. 3 Industries, households, commercial establishments use 1 Kilowatt (kW) of power. 4 Force and displacement are both vector quantities, but their dot product gives work done, which is a scalar quantity.
How to say work is done?
A1. You can say that work is done when it satisfies two essential conditions. Firstly, force should act on the body. Secondly, the body should move in the direction of the force applied, or it should move in the opposite direction. In other words, the object must change its place. For example, a lady moves a bucket of water from the kitchen to the bathroom. Here, she applies force to the bucket and the place of the bucket changes position from the kitchen to the bathroom. Thus, work is equal to the product of force and distance of the bucket from the kitchen to the bathroom. Power is the energy the lady requires to move the bucket from one place to another in the given time.
What is the power you apply to displace an object over a distance in a given time?
The definition of work is the power you apply to displace an object over a distance in a given time.
When is work done positive?
Work done is positive when the direction of force acting on the object and displacement of the object both are in the same direction. For example: Kicking a ball Work done is negative when the direction of force acting on the object and displacement of the object are in the opposite direction.
What is power expressed in?
Power can be expressed in units of watts (W). This unit can be used to measure power related to any form of energy or work. You have most likely heard the term used in relation to electrical devices, especially light bulbs. Multiplying power by time gives the amount of energy. Electricity is sold in kilowatt-hours because that equals the amount of electrical energy consumed.
How to find power?
Power is the rate at which work is done. In this case, rate means per unit of time. Power is calculated by dividing the work done by the time it took to do the work.
How does kinetic energy work?
Kinetic energy depends on the mass of an object and its velocity, v. When we drop the rock the force of gravity causes the rock to fall, giving the rock kinetic energy. When work done on an object increases only its kinetic energy, then the net work equals the change in the value of the quantity. 1 2 m v 2 .
What is kinetic energy?
Kinetic energy is also called energy of motion. A moving object has kinetic energy. Potential energy, sometimes called stored energy, comes in several forms. Gravitational potential energy is the stored energy an object has as a result of its position above Earth’s surface (or another object in space).
What does work on a rock equal?
The work we do on the rock also equals the rock’s gain in gravitational potential energy, PEe.
How are joules related to energy?
Force is measured in newtons and distance in meters, so joules are equivalent to newton-meters ( N ⋅ m) ( N ⋅ m) Work and energy are closely related. When you do work to move an object, you change the object’s energy. You (or an object) also expend energy to do work.
Why do we buy electricity in kilowatt hours?
Also explain that we buy electricity in kilowatt-hours because, when power is multiplied by time, the time units cancel, which leaves work or energy.
Mechanical Work
Power
Kinetic Energy
Potential Energy
Efficiency
The Law of Conservation of Mechanical Energy
Different Tasks For Work
- If the task requires finding a mechanical work, then first select the method of its finding: 1. Work can be found by the formula: A = FS ∙ cos α. Find the force doing the work and the amount of body movement under the action of this force in the chosen frame of reference. Note that the angle must be selected between the force and displacement vecto...
The Law of Conservation of Energy and The Dynamics of Rotational Motion
Inelastic Collisions
Absolutely Elastic Blow