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Question.10. your solution of Work & Energy, Important Questions (with answers), Class 9, Science | EduRev Notes search giving you solved answers for the same. Explain.Ans. NCERT Solutions Class 9 Science Chapter 11 Work And Energy. Force and time B. 1 watt is the power of an agent which can do one joule of work in one second. No as m ass and velocity cannot ne negativeQ.12. Question.5 Important Questions for CBSE Class 9 Science Chapter 11 Work, Power and Energy IMPORTANT QUESTIONS 1-MARK QUESTIONS Question.1 Does work done depend upon the velocity of the body. (i) Suma is swimming in a pbnd. An electrical geyser of 1.5 kW works for 2 hours. (b) Is it possible that a force is acting on a body but still the work done is zero? out Class 9 lecture & lessons summary in the same course for Class 9 Syllabus. Solution. The expression is KE = 1/2 mv2, where ‘m’ is the mass and V is the velocity of the body. Question.7 What type of energy is stored in the spring of a watch? Solution. Force and displacement C. Power and displacement D.Force and acceleration Q27. Solution. The work required to be done to stop a car = ( ½ mu2) - ( ½ mv2)=  ½ m(u2-v2)= 1/2x1500(602-0)=2.08J. Hence, work done = FS = 4900 x 4 = 19600 J, Question.19 A force of 10 N displaces a body by a distance of 2 m at an angle 60° to its own direction. KE = 1/2 mv2, therefore, if velocity is made 5 times KE will increase by 25 times. Question.2 [SAll-2014] Force = 7N Answer. When a body lifted the work is done against the force of gravity. Answer. Question.10 A spring which is kept compressed by tying its ends together is allowed to be dissolved in an acid. [SAll-2013] [SAll-2012] Tests & Videos, you can search for the same too. Joule and Watt. So, in this section, we will be dealing with the important questions of chapter Work and Energy Class 9. Answer. Due to this heat, the temperature of the acid rises. It is the change of energy from one form of energy into another form of energy. Answer. No, because force cannot be zero for displacement on the surface of earth. The moon revolving round the earth under the centripetal force of attraction of the earth but earth does not do any work on the motion of The moon. Question.1 Calculate the electricity bill amount for a month of 31 days, if the following devices are used as specified : Consider the case of a body falling under gravity. [SA II – 2012] (ii) A donkey is carrying a load on its back. As a result, energy is stored in the spring in the form of elastic potential energy. From where does it get the kinetic energy ? MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers MCQs from Class 9 Science Chapter 11 – Work and Energy are provided here to help students prepare for their upcoming Science exam. (c) A TV of 120 W fro 6 hours. (b)What is the work done to increase the velocity of a car from 36 km h-1 to 72 km h~1 if the mass of the car is 1500 kg ? [SAII-2013] The potential energy of a freely falling object decreases progressively. Q.9. Answer. Answer. The answer is. [SA II – 2011] This is because the gravitational force and displacement are perpendicular to each other. Answer. In SI it is measured in watt. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 9.. Question.14 An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest ? Question.5 A body moves along a circular path. The kinetic energy of the object is used up in doing work against friction; which finally appears as heat energy. Answer. Within the electric cell of the battery the chemical energy changes into electrical energy. Answer. Question.49 A light and a heavy body have equal kinetic energy. Question.8 What is power? Answer.The work done by a force depends upon: But he does zero work relative to the shore as the displacement relative to the shore is zero. Question.3 The work done in lifting a box on to a platform does not depend upon how fast it is lifted up. What is the work done in this case ? […] A light and a heavy object have the same momentum find out the ratio of their kinetic energies. The energy possessed by a body by virtue of its motion is called kinetic energy. What kind of energy transformation takes place when a body is dropped from a certain height?Ans. Solution. The law of conservation of energy is not violated because the energy merely changes its form and is not destroyed. The initial and the final points of the path of the object lie on the same horizontal line. When a body moves in a circular path, then the displacement (S) is zero. (b) Work is the product of force and displacement. (v) Sound energy Question.15 Is it possible that some force is acting on a body but still the work done is zero ? Solution. just for education and the Work & Energy, Important Questions (with answers), Class 9, Science | EduRev Notes images and diagram are even better than Byjus! Value of g is - A. Solution. [SAII-2013] (b) Stretched string of a bow. Answer. Ahsan on June 4, 2020 at 9:33 am The best website ever without login id or anything it gives you all the question answers,numerical problems. Answer. The lighter body is moving fast. Answer. Does the velocity depend upon the mass of the particle? Answer. The work done is zero. Question.16 A freely falling object eventually stops on reaching the ground. (b)An electric bulb of 60 W is lighted for 10 hours everyday. Question.1 Look at the activities listed below. The winning team does work. Its SI unit is watt. Solution. (c) Work done is negative, as frictional force acts opposite to the direction of motion of the body. How high is the body if its mass is 20kg?Ans. Answer. Justify your answer. When a body falls freely towards the earth, then its total energy. Answer. Does this violate the law of conservation of energy? (c) It is the energy possessed by a body by virtue of its motion. Answer: (c) remains constant. This document is highly rated by Class 9 students and has been viewed 119696 times. (b) For a simple pendulum, the inter-conversion of energy is as shown in the table below : Question.2 Solution. We .know that KE∝ m, KE ∝ v2 Question.33 What will happen to the kinetic energy of a body if its velocity is halved ? Answer. At the mean position, the energy is wholly kinetic while at the extreme position it is wholly potential. (d) When a gas bums. The energy stored in the spring is obviously potential in nature (elastic potential energy to be more accurate). On reaching the ground, which will have greater kinetic energy and why ? Explain with an example. 11.3). Answer. The work done by the force of gravity on the satellite is zero because the force of gravity acts at right angles to the direction of motion of the satellite. (d) first increases and then decreases. Explain your answer giving a suitable example. The body may have energy but still does not perform any work, e.g., a book placed on a table has potential energy but is not performing any work. His displacement is along the horizontal direction. Therefore, A man is carrying the heavy luggage from […] Q1) How much work..... m is raised to a height h above the ground ? +ve B. It is measured as the product of force and displacement. Q.15. Explain. Question.35 Can a body possess energy even if it is not in motion ? Answer. linear momenta? EduRev is like a wikipedia Answer. Which one will have greater kinetic energy ? Answer. Has he done some work or not ? Energy is the ability of a body to do work. Using p = W/t = 1000/10 = 100 W. Question.27 Define average power. Justify your answer. State the law of conservation of energy. When is work said to be done against the force of gravity ? (i) The magnitude of the force. Think; What will be its kinetic energy when its velocity is doubled? Read: Work Power Energy > Important Physics GK [PDF] All answers are hidden under the black box. 746 watt. The work is equal to the product of the resultant force and the displacement undergone by the losing team. Zero, because force and displacement are perpendicular to each other. Question.6 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each. The force of gravity only changes the direction of motion of the i satellite. Question.3 Define work. of Work & Energy, Important Questions (with answers), Class 9, Science | EduRev Notes for Class 9, the answers and examples explain the meaning of chapter in the best manner. Answer. Worksheets are very critical for every student to practice his/ her concepts. Zero. Work done Force x Displacement =F.s = (10 N) x (4 rn) = 40 joule or 40J. The motion of the satellite is in the horizontal plane. Answer. Answer. Answer. . Question.5 A girl sits and stands repeatedly for 5 minutes. Answer. When we wind a watch, the configuration of its spring is changed. Eventually, the bob comes to rest, because during each oscillation a part of the energy possessed by it transferred to air and- m overcoming friction at the point of suspension. Question.4 Is it possible that a body be in accelerated motion under a force acting on the body, yet no work is being done by the force ? Answer. Question.7 Two bodies of equal masses move with the uniform velocities v and 3v respectively. Chapter 11. How much work is done by a force of 10 N in moving an object through a distance of 4 m in the direction of the force.Ans. When it moves from this extreme position to mean position, its PE again changes to KE. It has gotten 119701 views and also has 4.7 rating. Answer. Now, Work done = Force x Displacement Q.14. Answer. When a body does not perform any work, it never implies that the body has no energy. Work & Energy, Important Questions (with answers), Class 9, Science | EduRev Notes chapter (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check If you need help go to this website FBISE notes or type the subject and class Thus, work done, W = FS cos 90° = 0. What is the ratio of their Answer. Question.23 What is the amount of work done by a force when a body moves in a circular path ? [SAll-2012] Solution. Answer. A force of 20 N displaces a body through a distance of 1 m at an angle of 60° from its own direction. Answer. Work done is given by the expression W = FS cos θ. Let us take it that the force acts on the object through the displacement. Its SI unit is joule. Given, W = 1000 J, t = 10 s, R = ? Question.45 Name the practical unit of power in engineering. What is its speed just before it hits the ground? ☞ Class 12 Solved Question paper 2020 ... Download NCERT Solutions for Class 9 Science Chapter 11 Work And Energy (Link of Pdf file is given below at the end of the Questions List) In this pdf file you can see answers of following Questions NCERT Solutions Intext Questions Page no.148 Question.1 If the friction constant between surface and box is 0,3; find the work done by F, work done by friction force and work done by resultant force. quantity. Work and Energy CBSE Class 9 Science Chapter 11 - Complete explanation and Notes of the chapter ‘Work and Energy’.. Can energy be created ? 9.8 m/s B. Question.8 The masses of scooter and bike are in the ratio of 2 : 3 but moving with same speed of 108 km h~1. When is work done by a force negative? Question.12 A man weighing 70 kg carries a weight of 10 kg to the top 6f a tower 100 m high. The potential energy of a body = mgh h = PE/mg = 39600j/20kg x9.8m/s2=198m, Q.3. (a) 3 bulbs of 40 W for 6 hours. Question.17 Does every change in energy of the body involve work ? How much work is done in ploughing the length of the field ? (b) Two bodies of masses m, and m2 have equal kinetic energies. Work done in lifting a body = Weight of body X vertical distance The work done in lifting  = W = mgh = 200 kg x 10m/s2 x6 m = 1200J. (b) 4 tubelights of 50 W for 8 hours, [SAII-2010] Calculate the work done. Given, F = 10 N;S = 2m;θ = 60°. Find the electrical energy units consumed in a day. Work done by F; WF=F. What happens to the potential energy of the spring ? Give one example each of potential energy (i) due to position (ii) due to shape.Ans. The moon revolving round the earth under the centripetal force of attraction of the earth, but earth does no work on the motion. Work is measured as product of- A. Answer. When a satellite moves around the Earth in a circular path, then the force of gravity acts on it directed towards the centre. We further aim to acknowledge children with all the binding terms, keeping in mind about the previous year questions. and, therefore, gets dissipated in air. Question.2 What is the work done by a coolie walking on a horizontal platform with a load on his head? [SAII-2010] Answer. Initial KE/Final KE = ( ½ mu2) /( ½ mv2) = ( ½ mu2) /{ ½ m(3v2)} =1:9, Q.8. (ii) the power developed, (g = 9.8 ms-2) All types of questions are solved for all topics. Work done = Force x Displacement = 140 x 15 = 2100 J. Question.23 What is the kinetic energy of an object? It is defined as the energy possessed by a body by virtue of its position or change in shape. Work done = Force x Displacement If force, F = 1 N and displacement, s = 1, m then the work done by the force will be 1 Nm or1 J. Give the rate of electricity is Rs 2.50 per unit. NCERT solutions for Class 9 Science Chapter 11 Work and Energy helps you lay a good foundation for your exam preparation. Question.3 In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Question.11 What is the work done by the force of gravity on a satellite moving round the earth? Work Power Energy Exams1 (Work) and Problem Solutions 1. (a) Is it possible that a body be in accelerated motion under the action of a force, yet no work is being done by the force? Answer. Ans. Answer. When we wind our watch, we wind the spring inside the watch. (iii) Light energy Answer. We know that work done W = FS cos 0, where 0 is the angle between F and S. Clearly, W will be -ve, if 0 is between 90° and 180° because then cos 0 will be -ve. [SAll-2011 ] using search above. [SAII-2010] (i) Potential energy due to position: Water stored in dam has potential energy. Question.5 List two essential conditions for work to be done. (b)Kinetic energy is given by the expression Find the amount of work done. Question.16 What is the work done on a body moving in a circular path ? Solution. NCERT Solutions Class 9 Science Chapter 11 Work, Power And Energy – Here are all the NCERT solutions for Class 9 Science Chapter 11. Hence, there it no kinetic energy but the object may possess potential energy. Answer. Answer. Students, teachers and parents can download all CBSE educational material and extremely well prepared worksheets from this website. Answer. Question.22 A man whose mass is 50 kg climbs up 30 steps of a stair in 30 s. If each step is 20 cm high, calculate the power used in climbing the stairs. ; A solution is a homogeneous mixture of two or more substances.The major component of a solution is called the solvent, and the minor, the solute. (i) the mass of the body is doubled at constant velocity? Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Work and Energy. Answer. In case of a body moving along a circular path, the force (centripetal) is always along the radius while displacement is tangential. Answer. The person does not do work because no displacement takes place in the direction of applied force as the force acts in the vertically upward direction. It can only change […] Question.1 justify giving proper reasoning whether the work done in the following cases is positive or negative : (a)What is the commercial unit of energy ? Reason out whether or not work is done in the light of your understanding of the term ‘work’ (e) Potential energy into kinetic energy. (c) Give the commercial unit of energy in Joules. (i) Work is done because the displacement of swimmer takes place in the direction of applied force. In such a situation no acceleration acts on the object. Answer. Answer. When a work of 1 joule is done in 1s, the power is said to be one watt. Question.21 Write an expression for the work done when a force is acting on an object in the direction of its displacement. Answer. Work done to bring the object to rest is equal change in kinetic energy of the object. As per the statement of Q.9, the amount of addition work done by the car, after applying the accelerator, is (a) 1.5 Mv 2 (b) 2.5 Mv 2 (c) 3.5 Mv 2 (d) 4 Mv 2 Answer. How is work measured ? justify your answer. The speed is doubled. –ve C. zero D. unknown Q26. The SI unit of potential energy is.joule. Solution. Therefore, work done W = FS cos θ = FS cos 90° =0. Its unit is watt. Yes, mechanical energy comprises of both potential energy and kinetic energy. This decrease in potential energy appears as an equal amount of increase in kinetic energy. Question.12 When a book is lifted from a table, against which force work is done ? Some state boards this topic is in class 9. (b) Work done by the gravitational force is negative, as the bucket moves upwards i.e., opposite to the gravitational force. Question.20 A boy of mass 40 kg runs up flight of 50 steps each 10 cm high in 5 seconds. When a force of 1 newton acting on a body displaces it in its own direction. Draw a graph to show variation of potential energy with time. Write commercial unit and SI unit of electrical energy. What is its SI unit ? Which one is moving fast ? Question.3 In a tug-of-war one team gives way to the other. (d) Work done is positive because applied force acts along the same direction as the direction of motion of the body. W = P x t = 500 x 10 = 5000 Wh – 5 kWh. Explain No. Question.9 An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. Reasoning Questions Does the work done by the force have a negative or a positive magnitude ? (a) Can a body have energy without having momentum ? The work done by the force of gravity on a satellite moving around the Earth is zero. 5 MARKS QUESTIONS Therefore, by doubling the mass, the kinetic energy doubles, while by doubling the velocity, the kinetic energy increases four times. Question.2 Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. [Take g = 10 ms-2] Yes. Question.25 A woman pulls a bucket of water of total mass 5 kg from a well which is 10 m in 10 s. Calculate the power used by her. [SAII-2014] (iii)the mass of thesbody is doubled but the velocity is reduced to half? Which one will have the greater momentum ? Work done = Force x Displacement, Question.22 A pair of bullocks exert a force of 140 N on a plough. Answer. Kilowatt is the unit of power and kilowatt hour is the unit of energy. Question.44 Name at least three commonly used units of energy. Answer. 5=100 joule Work done by friction force; Wfriction=-Ff. [SAII-2010] [SA II-2011] NCERT Exemplar Problems Class 9 Science – Work and Energy Multiple Choice Questions (MCQs) Question 1: When a body falls freely towards the earth, then its total energy (a) increases (b) decreases (c) remains constant (d) first increases and then decreases Answer: (c) Since, total energy of the system is always conserved, so when a […] Solution. [SAU-2011] NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Solution. (a)Derive an expression for kinetic energy of a body having mass m and moving with a velocity v. Where is the energy you spend going? Question.4 What will cause greater change in kinetic energy of a body? No. On reaching the ground, the whole of the potential energy of the body gets converted into kinetic energy. Question.6 When is 1 joule of work said to be done ? [SAII-2013] [SAll-2013] [SAII-2011] Answer. It does not violate the law of conservation of energy. Do check out the sample questions Answer. Give SI unit of each. (b) decreases. Answer. Answer. When the pendulum is released so that it stars moving towards right, then its PE changes into KE, such that in mean position, it has maximum KE, and zero PE. Since the body is moving downwards, the work done by force to gravity will be +ve but that is against the upward thrust will be -ve. It is also defined as the capacity to do work. You can download Free Work & Energy, Important Questions (with answers), Class 9, Science | EduRev Notes pdf from EduRev by (iii) The angle between force and displacement. Answer. Question.4 [SAII-2014] How much work is done in doing so? Answer. (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket. Whatever, is the decrease in PE due to loss of height, same is the increase in the KE due to increase in velocity of the body. Question.16 Which would have greater effect on kinetic energy of an object – doubling the mass, or doubling the velocity? Answer. To shoot an arrow; the bow is released. Solution. The displacement is, say 8 m, in the direction of the force. [SAII-2013] When a body falls freely towards the earth, then its total energy Question.14 What is the work done when the force acting on the body and the displacement produced in the body are at right angles to each other ? Name the two forms. (b) Taking the example of a simple pendulum, explain the variations in the forms of energy and the; inter-conversions involved. displacement is, however, tangential to the radius i.e., 0 = 90°. (a) The energy possessed by a body by virtue of its position or configuration. All the questions and answers are important for CBSE Class 9 … (vi)No work is done, because displacement does not take place. [SAII-2013] Answer. Since the body returns to a point which is on the same horizontal line through the point of projection, no displacement has taken place against the force of gravity; therefore, no work is done by the force due to gravity. It states that energy can neither be created nor destroyed. Work is said to be done when a force causes displacement of an object in the direction of applied force. Work done,W =Fscos0 =20 X 1 X cos60°=20X 1 X 1/2 = 10J. Answer. Yes, it is possible, when the force is perpendicular to the direction of motion. Those students who refer the NCERT Solutions regularly are benefited with the comprehensive methodology of the topic, and also with the detailed step by step procedure, which will fetch them good marks in their examinations. We are providing important Multiple Choice Type Questions (MCQs) from Class 9 Science Chapter 11: Work and Energy. Question.17 What kinds of energy transformations take place at a thermal power station ? ~ Solution. W = 10 x 2 x cos 60° = 10 x 2 x 1/2 =10J. (a) Define average power. Question.7 What are the various energy transformations that occur when you are riding a bicycle? (cf) Chemical energy into heat energy. [SAII-2013] What is the work done by the force of gravity on a satellite moving round the Earth? Explain. Answer. The PE of the spring gets converted into KE of acid molecules whose temperature rises. [SAII-2014] Answer. (c) remains constant. Visit to Discussion Forum to share your knowledge or ask your doubts with our experts and your classmates. Question.3 Explain that the flying bird has; potential and kinetic energy and give their expressions. Complete His displacement is along the horizontal direction. Answer. The potential energy of the spring gets converted into heat energy (kinetic energy of acid molecules). Question.21 What is the work done by a coolie walking on a horizontal platform with a load on his head ? Answer. Work and Energy Class 9 MCQs Questions with Answers. Work done W = mgh, where g is acceleration due to gravity. Question.6 Define : (a) power (b) work done (c) kinetic energy. After falling, it rolls on the rough ground and finally comes to rest. How do you differentiate kilowatt from kilowatt hour?Ans. Thus, the sum of the potential energy and kinetic energy of the object would be the same at all points. (a) Power is defined as the rate of doing work. [SAII-2014] Answer. Does this violate the law of conservation of energy? giving one example. Answer. Answer. Question.46 Name at least six forms of energy. (vi)Solar energy. By continuing, I agree that I am at least 13 years old and have read and agree to the. Question.12 Can there be displacement of an object in the absence of any force acting on it? According to the law of conservation of energy, the total energy of system remains unchanged. RD Sharma Solutions for Class 9 Mathematics, English Grammar (Communicative) Interact In English- Class 9, Class 9 Physics, Chemistry & Biology Tips & Tricks. Question.1 An object of mass mwhen raised To height h possess a potential energy of 1200 J. (c)Where does an oscillating pendulum have maximum PE and KE ? Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero. Now, displacement undergone by the car, S = 4 m Describe the energy changes involved in the process. How many units of electrical energy is consumed by this bulb in one day ? 3 MARKS QUESTIONS Class 10 - Maths+Science; Class 10 - Science; ... WORK AND ENERGY. Question.10 A battery lights a bulb. Answer. (b) When a body falls from the top of a hill. NCERT Solutions for Class 9 Physics Chapter 4 Work and Energy In this chapter, you will learn about the relationship between work and energy, scientific conception of work and also different forms of energy such as Kinetic energy, Potential energy, application of kinetic and potential energy, and energy of an object at a certain height. Explain. A unit bigger than watt is kilowatt. Question.48 What is horsepower ? Answer. Question.43 When an arrow is shot from its bow, it has kinetic energy. Energy consumed = Power x time taken = 2000W x  10 h = 20000 Wh = 20 kWh. Solution. Filed Under: CBSE Tagged With: CBSE 9 Work, CBSE Class 9, CBSE Important Question for Class 9 Science, Power and Energy, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, CBSE Important Question for Class 9 Science, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10.

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