Mechanical energy relates to an object’s speed and position. We apply the Energy-Interaction Model to systems with changing speed and position, focusing on kinetic energy (mass and speed) and gravitat...Mechanical energy relates to an object’s speed and position. We apply the Energy-Interaction Model to systems with changing speed and position, focusing on kinetic energy (mass and speed) and gravitational potential energy (height). Examples, like lifting and throwing, show energy transfers in mechanical systems. We also examine cases where mechanical energy converts to thermal energy through friction, highlighting interactions between mechanical and thermal energies.