Question

When a child descends a sliding board in a playground, does the total macroscopic mechanical energy of the system (Earth, slide, and child) maintain its value, increase, or decrease?

Answer 1

Answer : 1. maintain its value  

because the child descend its gravitational potential energy is converted into its kinetic energy. Thus total macroscopic mechanical energy of the system is conserved. the total mechanical energy of a system remains constant if the external forces do no work. This is called the principle of conservation of energy. in our case n oexternal force is acting on its so we say that the total mechenical energy is conserved

answered by: anonymous