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# What is a form of mechanical energy?

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Mechanical energy is the sum of all the forces acting on or in a system as a result of its chemical state (chemical-potential), relative position (potential) and state of motion (kinetic). Work, or a force acting upon an object, is the use of mechanical energy to affect a system.

## Keep Learning

An example of the total mechanical energy of a complex system is the human body. It converts chemical-potential energy in the form of food and drink into potential energy stored in the muscles. This energy can then transform into kinetic energy in order to move its mass around in order to perform work, such as walking or driving.

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## Related Questions

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To calculate the net force, or unbalanced force, of a Newtonian object, find the sum of all forces presently acting upon it. These include gravity, friction and other forces depending on the scenario. You need only a few figures and computations to calculate an object's net force, which is required for acceleration and is expressed in Newtons.

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Mechanical energy is the sum of the kinetic and potential energy of an object that gives it the ability to do work. Work is defined as the ability to cause an object to be displaced by another object due to force.

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Examples of external forces include the force applied to the system, air resistance of an object, force of friction, tension and normal force. Internal forces include the force of gravity, spring force, and magnetic and electrical field forces. Forces are either internal or external.