In other words the work done is equal to the change in energy.
Work energy principle formula.
K is a measure of how difficult it is to stretch a spring.
This linear relationship between the force and the displacement is known as hooke s law.
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.
W refers to the work done by the force f.
F kx where k is known as the spring constant.
The formula to find the work done by a particular force on an object is w equals f d cosine theta.
The work energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.
The formula for power is.
Power can be defined as the rate at which work is done i e.
If energy is not conserved then it is used to do work.
The net work done by the forces acting on the body is equal to the change in kinetic energy of the body.
A horsepower is equal to 550 ft lb s and a kilowatt is 1000 watts.
The unit of power is watt w.
Mgh 0 5mv 2 force distance k.
Wnet kf ki k.
The larger k is the stiffer the spring is and the harder the spring is to stretch.
For a constant torque the work can be expressed as and for a net torque newton s 2nd law for rotationgives.
Work energy principle for angular quantities.
Mgh 0 5 mv 2 f d k.
In physics we can define energy as the capacity to do work.
For a spring this can be written.
Mathematically it is expressed as.
Now to make it work you need to keep track of sign for each.
It is also known as the principle of work and kinetic energy.
Sometimes people forget that the work energy theorem only applies to the net work not the work done by a single force.
The work energy principleis a general principle which can be applied specifically to rotating objects.
For pure rotation the net work is equal to the change in rotational kinetic energy.
In other words w is telling you the amount of energy that the force f is giving to the object.
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 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.
The amount of energy transferred by a force is called the work done by that force.
Pe ke w k.
The si unit of energy is joules j which is named in honour of james prescott joule.
Work and potential energy.
Potential energy kinetic energy work constant.
