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Mechanical Energy

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INFORMATION ABOUT THE SMALL IDEA

Energy > Forms, conservation of energy and energy transfer > Mechanical Energy 

Mechanical energy is the sum of potential energy and kinetic energy (the two main forms of energy). When in an object act only conservative forces (e.g. gravity) its mechanical energy remains constant. Elastic collisions are examples where the mechanic energy of a system is conserved.  

Connection to Big Idea about forces: The principle of the conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative ones (e.g. gravity, electric force). Elastic collisions are an example where the mechanic energy is conserved.

Connection to Big Idea about the universe: Any object in motion has mechanical energy. For example, a planet’s orbit around a star is determined by its mechanical energy.

Connection to Big Idea about particles: Electrons have mechanical energy due to their orbits around the atomic nucleus. The electrons’ orbits are defined by the mechanical energy of the system.

Connection to Big Idea about quantum: Contrary to the prediction of classical electrodynamics, the existence of stable atoms according to Bohr’s theory are due to the presence of specific trajectories of orbiting electrons in which the mechanical energy of the system remains constant. 


Subjects related: Chemistry, Physics

Age ranges: 12-13,13-14,14-15,15-16

 

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PLATON is a two-year European project launched on September 2016. It aspires to provide teachers and school communities with a coherent teachers’ training framework which will update their current teaching practices. More particularly, PLATON aims to offer an open and innovative training framework to teachers of primary and secondary education which will focus on:

  • Promoting student-centred teaching approaches;
  • Promoting a holistic interdisciplinary approach;
  • Support the use of online educational tools;
  • Support the meaningful collaboration between teachers of the same school.

 

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