NOVEL THINKING

The power is P = W/t = 19620J / 15s = 1308 J/s = 1308 W. P=f.v. All forms of energy are either kinetic or potential.

This chapter is very important because it will test your knowledge of the previous two chapters namely, Kinematics, Laws of Motion and it will be also useful and crucial for you for solving questions from the next chapters namely System of Particles, Rotational Motion and to some extent gravitation. Work and energy can be considered as two sides of the same coin. Let’s understand this theorem with the help of an example.

You should also understand how scalar product of the two vectors is operated and what is the significance of scalar product.

Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat.

For a quantity of work W that is done in an amount of time t, the power done is, The unit for power is the Watt (W), which is equal to a Joule per second, 1 W=1 J/s Power can also be expressed in as force F times velocity v. Since work is given by force times distance, W = Fd, and velocity is distance divided by time, v = d/t, then … Chapter 6: Work, Energy and Power Tuesday February 10th Reading: up to page 88 in the text book (Ch.

It is a measure of how quickly work is done. by a force (Both constant force and a variable force), conservation of mechanical energy, potential energy, kinetic energy, work-energy theorem, Potential energy of a spring, conservative and non-conservative forces, power, You will also come across a very important theorem of this chapter, known as a. theorem. We often come across the word Power as well, for example, the bodybuilder hit the punching bag with huge power, so in a very crude way, we could say that the rate of doing work is power. Let us try to understand what these are, through this chapter. Note that the form of energy (K.E and P.E) keeps on changing. Revision of Grade 9; States of Matter and the Kinetic Molecular Theory; Atomic structure; Periodic Table; Chemical Bonding; Transverse Pulses on a String or Spring; Waves - … This disposition of ball from position A to B is known as displacement (d). 6) •Finish Newton’s laws and circular motion •Energy • Work (definition) • Examples of work •Work and Kinetic Energy •Conservative and non-conservative forces •Work and Potential Energy •Conservation of Energy Dimensional formulae of work =[F]×[S] = MLT2 L = [ML2T2 ] SI unit of work is Joule (J). If under a constant force F a body is displaced through a distance s in time t, the power.

If u, > u2 they will collide. Copyright © 2020 Pathfinder Publishing Pvt Ltd. You must have heard these terms work, energy, and power very frequently in your day to day life, like a barber cutting hair, a laborer lifting bricks and transporting them and a student studying are all said to be working.

This means energy is something which tells about the capacity to do the work. You must be good at basic laws like the law of energy conservation and theorems like a work-energy theorem Because you might get conceptual questions based on these laws And theorems. Because work, energy, and power all are a scalar quantity.

Class 6. But here in physics, work is defined using very specific words and it has a very precise meaning. Relation between Kinetic energy and Linear momentum CAQ Question 2. Work:- Work done W is defined as the dot product of force F and displacement s. Here θ is the angle between and .

Trajectory - Horizontally Launched Projectiles Questions, Vectors - Motion and Forces in Two Dimensions, Circular, Satellite, and Rotational Motion, Calculating the Amount of Work Done by Forces, Analysis of Situations Involving External Forces, Analysis of Situations in Which Mechanical Energy is Conserved, Lesson 1 - Basic Terminology and Concepts. Find the average resistance offered by the mud wall. In this lesson we revise the definition of work as well as revise the idea that power is the rate of transfer of energy. ∴U = mgh. Tech Companion - A Complete pack to prepare for Engineering admissions, MBBS Companion - For NEET preparation and admission process, QnA - Get answers from students and experts, List of Pharmacy Colleges in India accepting GPAT.

Along the way, we'll talk about work, kinetic energy, potential energy, and conservation of energy. That is why the kinetic energy is not conserved. If θ= 180°, i.e., force and displacement are. Work → For doing work, energy is required. Power can be defined as the rate at which work is done i.e.

If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Gravitational Potential Energy: The work done to raise the mass m to a height h against the gravitational force of attraction, W = F.s = mg × h =mgh This work done is stored in it as potential energy. special attention to questions on springs and try similar questions from HCV and  Entrance360 site. Therefore, it can be calculated by dividing work done by time. For Work Power and Energy chapter concepts in NCERT is enough and practice questions which are asked in previous questions and you can follow, for JEE preparation like Concepts of Physics (H. C. Verma) and Understanding Physics by D. C. Pandey (Arihant Publications). Work, Energy and Power. CAQ Question 1. ie., power can be expressed as the dot product of force and velocity. Find the energy obtained required for the burning of the casing. Work Energy Theorem for a variable force: Consider a variable force[latex]\vec { F } [/latex] acting on a body of mass m and produces displacement [latex]\vec { ds } [/latex] in the same direction.

List of Hospitality & Tourism Colleges in India, Top Medical Colleges in India accepting NEET Score, MHCET Law ( 5 Year L.L.B) College Predictor, List of Media & Journalism Colleges in India, B. A light body and a heavy body have the same kinetic energy. Work is a scalar quantity, Its S1 unit is joule and CGS unit is erg. But in all cases the kinetic energy is not conserved.

Grade 10.

Thanks a lot . Concepts of work, kinetic energy and potential energy are discussed; these concepts are combined with the work-energy theorem to provide a convenient means of analyzing an object or system of objects moving between an initial and final state. Work is done by a force (Both constant force and a variable force), conservation of mechanical energy, potential energy, kinetic energy, work-energy theorem, Potential energy of a spring, conservative and non-conservative forces, power.

Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. If u, > u2, they will collide.

We shall consider two cases: 1. Note: When a body is released from height h. it comes down with an increasing speed- i The velocity y with which it hits the ground is calculated, as we know that the gravitational P.E of the body at height h transforms itself as K.E of the body on reaching the ground.

Note: When a body executes circular motion with uniform speed, there is no change in its kinetic energy. In this article, we will learn all about the concept of work, power and energy. It strikes another mass of 1.00 kg and then they move together as a single body. Solution - We will take the help of Work energy theorem for solving this problem.

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