Concepts of Work and Energy in Physics
Work Energy and Power, Different types of energies, potential ehnergy, Kinetic energy, work energy theorem, Power
Description
Those under 18 may use the services only if a parent or guardian opens their account, handles any enrollments, and manages their account usage.
Course on Work Energy and Power is for learners and students preparing for Advance Placement Physics examination and other college level examination . Also students perparing for various engineering and medical entrance examination can also take up couse. Any underage student or learner must take up the course under his/her parent guidance.
Conservation laws play an important role in physics. Such laws assert that some
quantity is conserved, which means that the quantity remains constant even when
particles or bodies suffer drastic changes involving motions, collisions, and reactions.
One familiar example of a conservation law is the conservation of mass. Expressed in
its simplest form, this law asserts that the mass of a given particle remains constant,
regardless of how the particle moves and interacts with other particles or other bodies.
In the preceding two chapters we took this conservation law for granted, and we treated
the particle mass appearing in Newton’s Second Law (ma = F) as a constant, time independent quantity.
More generally, the sum of all the masses of the particles or
bodies in a system remains constant, even when the bodies suffer transformations and
reactions.
This conservation law is one of the most fundamental laws of nature. Although we will derive this law from
Newton’s laws, it is actually much more general than Newton’s laws, and it remains
valid even when we step outside of the realm of Newtonian physics and enter the realm
of relativistic physics or atomic physics, where Newton’s laws fail. No violation of the
law of conservation of energy has ever been discovered.
In mechanics, we can use the conservation law for energy to deduce some features of the
motion of a particle or of a system of particles when it is undesirable or too difficult to calculate the full details of the motion from Newton’s Second Law. This is especially
helpful in those cases where the forces are not known exactly.But before we can deal with energy and its conservation, we must introduce the concept of work. Energy and work are closely related. We will see that the work done by
the net force on a body is equal to the change of the kinetic energy
What You Will Learn!
- Understand the concept of work in Physics
- Kinetic energy and solve problems based on kinetic energy
- Work kinetic energy theorem
- Gravitational Potential energy
- Elastic potential energy
- Mechanical energy conservation
- Power
Who Should Attend!
- Students preparing for Physics exam of Advance placement