Work Energy Principle Formula

W refers to the work done by the force f.

Work energy principle formula.

The unit of power is watt w. Potential energy kinetic energy work constant. Wnet kf ki k. The formula for power is.

A horsepower is equal to 550 ft lb s and a kilowatt is 1000 watts. The work energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy. In physics we can define energy as the capacity to do work. The work energy principleis a general principle which can be applied specifically to rotating objects.

The si unit of energy is joules j which is named in honour of james prescott joule. Work and potential energy. Power can be defined as the rate at which work is done i e. Sometimes people forget that the work energy theorem only applies to the net work not the work done by a single force.

For the potential energy the formula is. For a spring this can be written. F kx where k is known as the spring constant. Now to make it work you need to keep track of sign for each.

The larger k is the stiffer the spring is and the harder the spring is to stretch. The amount of energy transferred by a force is called the work done by that force. It is also known as the principle of work and kinetic energy. For pure rotation the net work is equal to the change in rotational kinetic energy.

For a constant torque the work can be expressed as and for a net torque newton s 2nd law for rotationgives. K is a measure of how difficult it is to stretch a spring. If energy is not conserved then it is used to do work. Mgh 0 5 mv 2 f d k.

Pe ke w k. The rate of doing work is equal to the rate of using energy since the force transfers one unit of energy when it does one unit of work. This linear relationship between the force and the displacement is known as hooke s law. For example the work done against gravity is equal to the change in the potential energy of the body and the work done against all resistive forces is equal to the change in the total energy.

The net work done by the forces acting on the body is equal to the change in kinetic energy of the body. Mgh 0 5mv 2 force distance k. Mathematically it is expressed as. Work energy principle for angular quantities.

Work energy theorem states that. Integration of this power over the trajectory of the point of application c x t defines the work input to the system by the force. The formula to find the work done by a particular force on an object is w equals f d cosine theta.