Energy is a conserved quantity that cannot be created or destroyed. SI unit of energy is the joule (J). Energy can be transferred between forms through work or heat
Mechanical energy is the sum of potential and kinetic energy. Energy is a scalar quantity measured in joules. Potential energy depends on position under conservative forces. Kinetic energy depends on speed and is calculated as half mass times square speed
Device demonstrates conservation of momentum and energy through swinging spheres. One sphere strikes stationary ones, creating pressure waves. Last sphere swings back and strikes stationary ones in opposite direction
Tellegen's theorem was published by Bernard D.H. Tellegen in 1952. States that the summation of instantaneous power consumed by elements in branches equals zero. Applies to networks obeying Kirchhoff's law. Works based on the law of conservation of energy
Calculus knowledge and high school physics concepts are essential. Gravity acceleration is allowed at 10 m/s² near Earth's surface. Vector quantities are bolded in formulas
Total energy consists of kinetic, potential, and internal energies. Internal energy includes sensible, latent, chemical, and nuclear energies. Mechanical energy can be converted to work completely