Symptoms and effects. The illustration shows severe gall infection at the upper crown area on the roots of a peach seedling. Galls form on the crown of the plant (the point at the soil line where the main roots join the stem) and on the roots. They can also form on the main stem above soil level, or on the branches. Galls first appear as small, pale, roughened lumps of tissue. They enlarge, darken, and become convoluted.
Conservation of energy. Conservation of energy, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy, or energy of motion.
If the forces sum to zero, and Force is the time derivative of Momentum, then the Momentum must be constant. Constant Momentum is the Conservation of Momentum. Conservation of Momentum is a derivative of the Conservation of Energy and not an independent Law of Conservation as proposed by many including Emmy Noether. The Conservation of Momentum is the vector part of the Quaternion Conservation of Energy. The Scalar part is said to be the Conservation of Energy.