Work Energy Principle Formula

The work energy principleis a general principle which can be applied specifically to rotating objects.

Work energy principle formula.

The larger k is the stiffer the spring is and the harder the spring is to stretch. In other words w is telling you the amount of energy that the force f is giving to the object. A horsepower is equal to 550 ft lb s and a kilowatt is 1000 watts. For the potential energy the formula is.

The net work done by the forces acting on the body is equal to the change in kinetic energy of the body. For a constant torque the work can be expressed as and for a net torque newton s 2nd law for rotationgives. W refers to the work done by the force f. If energy is not conserved then it is used to do work.

The formula for power is. Work energy theorem states that. The si unit of energy is joules j which is named in honour of james prescott joule. K is a measure of how difficult it is to stretch a spring.

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. Mgh 0 5 mv 2 f d 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. F kx where k is known as the spring constant.

Mgh 0 5mv 2 force distance k. Wnet kf ki k. Work and potential energy. In other words the work done is equal to the change in energy.

Potential energy kinetic energy work constant. Now to make it work you need to keep track of sign for each. Sometimes people forget that the work energy theorem only applies to the net work not the work done by a single force. In physics we can define energy as the capacity to do work.

The work energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy. Pe ke w k. Power can be defined as the rate at which work is done i e. This linear relationship between the force and the displacement is known as hooke s law.

The formula to find the work done by a particular force on an object is w equals f d cosine theta. For a spring this can be written. The unit of power is watt w. The scalar product of a force f and the velocity v of its point of application defines the power input to a system at an instant of time.

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 amount of energy transferred by a force is called the work done by that force. For pure rotation the net work is equal to the change in rotational kinetic energy.