What are the conditions for conservation of mechanical energy?

Three conditions for the conservation of mechanical energy: 1. From the WF outside = △E machine in the functional relationship, we can know that the broader mechanical energy conservation condition should be that the work done by the force outside the system is zero; 2. When When the system is not subject to external forces or the sum of the work done by the external forces is zero, the total momentum of the system remains unchanged, which is called the law of conservation of momentum; 3. Mechanical energy is conserved when only kinetic energy and potential energy are converted into each other.

Three conditions for the conservation of mechanical energy: From the WF outside = △E machine in the functional relationship equation, we can know that the broader mechanical energy conservation condition should be the force outside the system The work done is zero; when the system is not subject to external forces or the sum of the work done by the external forces is zero, the total momentum of the system remains unchanged, which is called the law of conservation of momentum; when only kinetic energy and potential energy (including gravitational potential energy and elastic potential energy) interact with each other Mechanical energy is conserved only during conversion.

Mechanical energy: Gravitational potential energy, elastic potential energy and kinetic energy are collectively called mechanical energy. Mechanical energy is conserved. Only when gravity (or spring force) does work, the gravitational potential energy (or elastic potential energy) and kinetic energy of an object are converted into each other. However, the total mechanical energy remains unchanged. Mechanical energy conservation only occurs when gravity (or spring force) does work. The object's gravitational potential energy (or elastic potential energy) and kinetic energy are converted into each other, but the total mechanical energy remains unchanged.

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