Energy, kinetic energy, work, dot product, and power 8. Iitjee work, power and energy solved questions pdf. Phet sims are based on extensive education research and engage students through an intuitive, gamelike environment where students learn through exploration and discovery. Work, energy, and power notes for iit jee, download pdf. Class 11 physics revision notes for chapter 6 work. They are probably the first thing you learn in your physics class.
Work is done when a force is exerted on an object, and the object moves from one place to another. Energy, kinetic energy, work, dot product, and power. Work and energy a powerpoint presentation by paul e. Download work energy power problems with solutions.
Difference between energy and power difference between. Physics notes class 11 chapter 6 work, energy and power work when a force acts on an object and the object actually moves in the direction of force, then the work is said to be done by the force. Find materials for this course in the pages linked along the left. In this article, we will learn all about the concept of work, power and energy. We can find the power output by the engine by taking the work done on the car divided by the time it took to do that work. Work energy and power worksheet answers pdf book manual. But i think when we start doing the math, youll start to get at least a slightly more intuitive notion of what they all are. The word energy has no connection with time but power does.
At maximum compression, the box has a speed of zero. Founded in 2002 by nobel laureate carl wieman, the phet interactive simulations project at the university of colorado boulder creates free interactive math and science simulations. Work done by the force is equal to the product of the force and the displacement of the object. What is the average power of the kinetic friction force. Efficiency is related to the amount of output work to input work. Scribd is the worlds largest social reading and publishing site. The terms work, power and energy are often used in our daily conversations but have different meanings in physics. Goal to investigate the friction of a string wrapped around. Work w is the energy transferred to or from an object by means of a. Tippens, professor of physics southern polytechnic state university. This distance is called the displacement of the object. Calculate the work done by a 47 n force pushing a pencil 0. Selina concise physics class 10 icse solutions work.
In physics, power is associated with energy and has a precise meaning. Produced in collaboration with pbs digital studios. Let us assume the variable force works from position x i to x f then according to the workenergy theorem the change in the kinetic energy is equals to the work done on by the variable force. Mellon, jeffrey unit 7 work, power, and mechanical energy. Power is measured in joules per second js r o watts w and is worked out using the formula. B car x has one quarter of the kinetic energy of car y. Energy is the capacity of an object to transform the world which surrounds it. How much work did you do and what was your power in running up a flight of stairs. Also, quite a bit of energy work is emotional and does impact our objectivity.
If the force f, and the displacement d, are in the same. Selina concise physics class 10 icse solutions work, energy and power. Pdf work, energy and power muhammad habibie academia. To find the work done on the car, we just need to figure out how much energy was given to the car. Download work energy and power worksheet answers book pdf free download link or read online here in pdf. Physclips ch 7 definition of work definition of kinetic energy. Energy transformed work done applied force x distance. Phys068 energy, work, and power revised \ch01 energy work, and power scofield supplemental notes september 8, 2009 page 1 of 12 chapter 1. These are the most important questions for j ee main, advance, upsee, bitsat and all other entrance exams. Well, one cannot even be blamed of finding a similarity between energy and power as they are interrelated. Energy cant be created or destroyed, it can only be changed from one type into another type. Define work as the product of displacement and the component of force parallel to the displacement when.
A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. Conversion equivalencies for energy or work 1 british thermal unit btu international table 251. The unit of work is the joule j consider a force that acts at an angle. Gravitational potential energy to kinetic energy transformation endofchapter test marking scheme. In this case, the car was given kinetic energy and it took two seconds to give it that kinetic energy. A powerful hoist needs energy fuel to keep on working. While energy is the ability to do work, power is its measurement, which calculates the time by which the energy has been used. Introduction to work and energy video khan academy. To be powerful means to be able to use a large amount of energy all the time. Rather most energy work consists of processes and actions in how you shape potential around you. The concept of power is concerned with how rapidly energy is being transferred or transformed when work is done. How is the work that your body expended, related to the potential energy gained.
Power, being the rate at which work is done, is measured in a different unit. Work,power and energy important question pdf for jee main. The terms work, energy and power are frequently used in everyday language. For instance, when a block is being pulled with tension t by a string whose angle of inclination is.
Work w is the energy transferred to or from an object by means of a force acting on the object. Work is a word that has a little bit of a different meaning in physics and today, shini is going to walk us through it. Type of energy associated with the motion of an object. If the boy is able to lift this much water out of the well in 8 seconds, how much is his power output in units of horsepower. The further it moves under the influence of your force, the more work you perform.
Mcq on work power energy objective type physics quiz set. Work, energy and power key concept energy is the ability to do work, and may be obtained in many forms. A farmer clearing weeds in his field is said to be working hard. In a drought affected region she may be required to carry it over large. Energy work understanding and working with spirit energy. Calculate the work done by a 47 n force pushing a 0. Energy, work, and power energy is a very important concept both in physics and in our world at large. Hi friends today we are providing 200 important questions on work power and energy. Microsoft powerpoint work, power, and energy animation 98 author. In physics, work is and im going to use a lot of words and they actually end up being kind of circular in their definitions. Work and energy can be considered as two sides of the same coin. All books are in clear copy here, and all files are secure so dont worry about it. Work, energy and power are the most used terms in physics.
Energy work is a real skill, and many variations of energy work exist to explore. Power of 1 power of 1 wwis work done at rate of 1 is work done at rate of 1 js. Powerthe power is defined as the work done over a time period or rate of work done is known as the power. Unit 7 work, power and mechanical energy below are the materials for unit 7 work, power, and mechanical energy. Doing work either transfers energy from one object to another or transforms it.
It is the rate of work done or rate of energy transfer. It is not that difficult to distinguish between energy and power. Physics notes class 11 chapter 6 work, energy and power. Work definition if an object moves in response to your application of a force, you have performed work. Additional materials will be added as we move through the unit. In this section of the transport unit, we will look at the energy changes that take place when a force acts upon an object. However, do understand energy work isnt shooting sparks from your fingers. This oer repository is a collection of free resources provided by equella. Work is the result of a force, acting over a certain distance.