Conservation of momentum
This law states that the total momentum of the system i.e. the product of masses and velocities of the particles taking part in an interaction is constant, before and after the process. This concludes that in order to keep the momentum of a system constant, if one part of a system moves in one direction, then simultaneously another part should move in exactly opposite direction. The simplest illustration of conservation of linear momentum can be reflected from the firing of a bullet from a gun as shown in figure. When a bullet is fired, it leaves the gun with a very high velocity and its momentum will be equal to:â€‹
in backward direction. The bullet moves with a very high velocity and its mass is very less. The gun counterbalances the momentum carried by the bullet because its mass is large, and its velocity is less.
Conservation of energy
This is the most basic rule of the universe that energy is conserved. Energy cannot be created or destroyed but it can transform into different variations. In an isolated system, the energy is always conserved, however, it may have different forms such as kinetic energy, potential energy, sound energy or thermal energy. The simple example of energy conservation can be observed from an object falling from a height under gravity. At the topmost point, its initial velocity is zero so, all its energy is due to the height. Hence, it is potential energy. As it starts moving down, its height decreases and its velocity increases, which implies that the potential energy decreases with decrease in height and kinetic energy increases with increase in velocity. In other words, the potential energy is transformed into kinetic energy and the overall energy of the system, which is the sum of kinetic and potential energy, will remain constant.
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