What is the formula of the law of conservation of mechanical energy?

The formula of the law of conservation of mechanical energy is K U = constant value, which means that the total mechanical energy (the sum of kinetic energy and potential energy) of the system in a closed system remains constant, that is, kinetic energy and potential energy can be converted into each other in the system, but the total mechanical energy never changes. Change.

The formula of the law of conservation of mechanical energy

The formula of the law of conservation of mechanical energy is:

K U = Fixed value

Among them:

• K: kinetic energy of the object
• U: potential energy of the object

## Meaning

The law of conservation of mechanical energy states that in a closed system (a system with no external forces), the total mechanical energy of the system (the sum of kinetic energy and potential energy) remains constant. In other words, kinetic energy and potential energy can be converted into each other in the system, but the total mechanical energy always remains the same.

Detailed description

When an object is in motion, it will generate kinetic energy, and when an object is in a force field, it will generate potential energy. According to the law of conservation of mechanical energy, kinetic energy and potential energy can be converted into each other, but their sum remains the same.

Example

• Pendulum: When the pendulum swings, it has the greatest potential energy and the smallest kinetic energy at its highest point. When it swings to its lowest point, potential energy is minimum and kinetic energy is maximum. The total mechanical energy during the swing of the pendulum remains constant.
• Free fall: When an object falls freely from a height, its potential energy is converted into kinetic energy, but the total mechanical energy remains unchanged.
• Trampoline: When a person jumps on a trampoline, his potential energy will be converted into kinetic energy. When the trampoline bounces, the kinetic energy will be converted into potential energy. In this cycle, the total mechanical energy remains unchanged. .

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