Question

The sum of kinetic and potential energies of the particle is constant The statement is known as ______________

• A. Principle of conservation of mechanical energy
• B. Law of nature
• C. Archimedes law
• D. Gravitational law

Answer 1

Answer:

A. Principle of conservation of mechanical energy

The principle of conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative forces. Mechanical energy is the sum of potential and kinetic energies. When a roller coaster car goes up a hill, its kinetic energy is converted to potential energy, which is then converted back to kinetic energy as the car descends. This principle applies to any system where only conservative force are acting