Concepts Of Work And Energy In Physics

Work Energy and Power, Different types of energies, potential ehnergy, Kinetic energy, work energy theorem, Power

What you'll 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

Requirements

Knowledge of basic algebra

Basic Knowledge of Calculus

Understanding of English

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 somequantity is conserved, which means that the quantity remains constant even whenparticles or bodies suffer drastic changes involving motions, collisions, and reactions.One familiar example of a conservation law is the conservation of mass. Expressed inits 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 treatedthe 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 orbodies in a system remains constant, even when the bodies suffer transformations andreactions. This conservation law is one of the most fundamental laws of nature. Although we will derive this law fromNewton’s laws, it is actually much more general than Newton’s laws, and it remainsvalid even when we step outside of the realm of Newtonian physics and enter the realmof relativistic physics or atomic physics, where Newton’s laws fail. No violation of thelaw of conservation of energy has ever been discovered.In mechanics, we can use the conservation law for energy to deduce some features of themotion 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 especiallyhelpful 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 bythe net force on a body is equal to the change of the kinetic energy

Overview

Section 1: Introduction

Lecture 1 Introduction

Lecture 2 Defintion of work

Lecture 3 Work done by force of gravity and tension with illustrative example

Lecture 4 Types of work

Lecture 5 Calculating work from dot product

Lecture 6 Practice problem 1 on calculation of work

Lecture 7 Illustrative examples on calculation of work

Lecture 8 Work done by variable force

Lecture 9 Calculating work done by variable force

Lecture 10 Calculating work done graphically and analytically

Section 2: KINETIC ENERGY

Lecture 11 Work kinetic energy theorem

Lecture 12 Work kinetic energy theorem 2

Section 3: Potential energy and energy conservation

Lecture 13 Problems based on Potential energy and mechanical energy conservation

Lecture 14 More problem based on gravitational and elastic potential energy

Section 4: Power

Lecture 15 Power

Lecture 16 Elevator and cage problem

Students preparing for Physics exam of Advance placement