mechanical potential energy
The potential energy of a spring is defined by this equation: U=.5kx2 U= potential energy (in joules) k= the spring constant x= the displacement of the spring from equilibrium. (the amount that the spring is stretched or compressed) This equation tells us that as a spring is compressed by a distance x, the potential energy increases proportionately to x2
kinetic energy
Let's say you compress the spring. Work (mechanical energy) is required to compress the spring; this energy is stored in the spring and can be recovered (converted to another type of energy) when the spring returns to its normal position.
That's called elastic energy, and it is a type of potential energy.
potential
The energy that is used by you to compress the spring to close the box is stored in the spring until some one opens the box and releases the energy in the spring.
potential energy because it is stored down in compression
Elastic potential energy. F=0.5kx^2
We call it elastic potential energy.
Potential energy.
Potential energy stored in a spring => kinetic energy of a toy
This is known as elastic energy. It is a type of potential energy.