The results of a study by Ingham and colleagues (1974) using rope pulling, in which confederates were thought to be pulling on the rope but in fact were not, indicated that differences between actual and potential performances were due to

Motivational decrease

Explanation: The study by Ingham and colleagues(1974) using rope pulling highlights that sometimes productivity is lesser when members work in a group than when the individual performances of those members are combined. That is the actual performance or input to the course is less than the potential performance exhibited by the members of the group. This is called social loafing in social psychology, when a individual puts in limited effort when working as part of a team than when working alone.

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.