Relationship Between Work and Potential Energy (PE)
Explore the relationship between work and potential energy: work done against a force stores energy as potential energy, and the amount of potential energy stored equals the work input.
Key Concepts
In a magnetic system, there is a direct, proportional relationship between the physical effort applied and the energy stored.
Input : The process begins with Work. This is the mechanical effort required to move a magnet against the direction it wants to go (e.g., forcing two repelling magnets closer together).
Common Questions
What is the relationship between work and potential energy?
Work done against a force — lifting an object, compressing a spring, or separating magnets — stores that energy as potential energy. The amount of potential energy equals the work done: PE = Work.
How do Grade 8 students connect work to potential energy?
Students calculate the work done to lift or compress objects, then verify that the object's potential energy increased by the same amount. This energy accounting demonstrates conservation of energy.
What examples illustrate the work-potential energy relationship?
Lifting a book stores gravitational PE equal to the work done against gravity. Stretching a rubber band stores elastic PE equal to the work input. Pushing repelling magnets together stores magnetic PE.