In physics, <answer>energy</answer> is a property of objects which can be transferred to other objects or converted into different forms. The "ability of a system to perform work" is a common description, but it is difficult to give one single comprehensive definition of <answer>energy</answer> because of its many forms. For instance, in SI units, <answer>energy</answer> is measured in joules, and one joule is defined "mechanically", being the <answer>energy</answer> transferred to an object by the mechanical work of moving it a distance of 1 metre against a force of 1 newton.[note 1] However, there are many other definitions of <answer>energy</answer>, depending on the context, such as thermal <answer>energy</answer>, radiant <answer>energy</answer>, electromagnetic, nuclear, etc., where definitions are derived that are the most convenient.
What is a property of objects which can be transferred to other objects or converted into different forms?
energy