Work Energy And Power Equations

In physics power is the amount of energy transferred or converted per unit time.

Work energy and power equations.

Work and energy can be considered as two sides of the same coin. The work w done by the net force on a particle equals the change in the particle s kinetic energy ke. In this article we will learn all about the concept of work power and energy. Review the key concepts and equations for power including the difference between power and energy.

Work energy and power. Science high school physics work and energy power. Latex text w delta text ke frac 1 2 text mv text f 2 frac 1 2 text mv text i 2 latex where v i and v f are the speeds of the particle before and after the application of force and m is the particle s mass. Andersen defines the terms energy work and power.

The time integral of this scalar equation yields work from the instantaneous power and kinetic energy from the scalar product of velocity and acceleration. Relating power and energy. Problem set overview this set of 32 problems targets your ability to use equations related to work and power to calculate the kinetic potential and total mechanical energy and to use the work energy relationship in order to determine the final speed stopping distance or final height of an object. So if we have a constant force of magnitude f newtons which moves a.

In older works power is sometimes called activity. Power is a scalar quantity. The kinetic energy of an object can be related to its mass and velocity with the formula this formula for kinetic energy can be found from the equation for work if the force is in the same direction as the object s displacement. In the international system of units the unit of power is the watt equal to one joule per second.

For the sake of simplicity we will consider the. This also means the constraint forces do not add to the instantaneous power. Then the work done by the force is the component of f in the direction of motion the distance the body moves as a result. Work done is measured in joules which has symbol j.

Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat. He also uses a simple example to calculate both work and power. The unit of kinetic energy is the same as the unit of work the joule j. Intro music atribution title.

The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. The fact that the work energy principle eliminates the constraint forces underlies lagrangian mechanics.