NCERT Solutions for Class 11 Physics Chapter 5 Work, Energy and Power

Potential energy is the energy stored by any object or system due to its position or the arrangement of its components. However, it is not affected by the environment outside the object or system, such as air or altitude. Potential energy is not transferable, it depends on the height or distance and mass of the object. K.E. can be transferred from one object to another via vibration or rotation. On the other hand, the kinetic energy of a moving object or particle system remains same. Unlike potential energy, the kinetic energy of an object is relative to other fixed and moving objects in its environment.

For example, if an object is placed at a higher height, the kinetic energy of the object will be higher. P.E. is converted into kinetic energy, kinetic energy is converted into potential energy, and then back again. It’s an endless cycle. Kinetic energy is created when potential energy is released, propelled by gravitational or elastic forces and other catalysts.

Kinetic energy is the energy of motion. When work is done on an object and it is accelerated, it increases the kinetic energy of the object. The most important factors in determining kinetic energy are the motion and mass of the object in question. Although mass is a universal measure, the motion of an object can occur in many different ways, including rotation around an axis, vibration, translation, or any combination of these and other motions.

The law of conservation of energy states that energy cannot be created or destroyed – it can only be converted from one energy form to another. This means that a system always has the same amount of energy and there is no need to add it from the outside. This is especially confusing in the case of non-conservative forces, where the energy is converted from mechanical to thermal, but the total energy remains the same. The only way to use energy is to convert it from one to another.

The change in the internal energy of the system can also be determined by mathematical equations given in chapter 6 of 11th Physics NCERT. Although these equations are very powerful, they can make it difficult to see the power of statements. The take home message is that energy cannot be created from scratch. Society has to get its energy from somewhere, although there are many sneaky places to get energy from certain sources, primary fuels, and primary energy streams.

Collision, in physics, is the sudden and violent collision of two objects when they are in direct contact, such as two billiard balls, a golf club and a ball, a hammer and a nail head, or falling objects on the ground. In addition to material properties, two other factors can affect the outcome of an impact: the force with which objects come into contact and time.

A common rule of thumb is that a hard steel ball dropped on a steel plate will almost bounce where it fell, whereas with putty or lead it will not. The collision of a steel ball with a steel plate is called elasticity, and the collision of a putty or lead ball with a steel plate is called in-elasticity or plasticity.

Between these extremes there are varying degrees of elasticity and corresponding responses to impact. Perfect elastic shocks can only be achieved at the atomic level. The kinetic energy of the reacting body is not lost; in a fully plastic shock, kinetic energy is lost the most. An elastic collision is a collision in which there is no net loss of kinetic energy in the system due to the collision.