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Here we have given Class 9 NCERT Science Textbook Solutions for Chapter 11 Work Power and Energy. Q1: A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through the displacement.
Key Features of NCERT Solutions for Class 9 Science Chapter 11: Work and Energy. Provides detailed explanations for all complex topics. Provides completely solved solutions to all the questions in the Class 9 Science NCERT textbooks. These solutions include important questions at the end of every chapter.
- 9 min
Sep 5, 2024 · Answer: The energy possessed by an object by virtue of its motion is known as the kinetic energy of the object. Question 7. Write an expression for the kinetic energy of an object. Answer: K.E. of an object = 1/2 mv 2 , where m is the mass of the object and v is the speed of the object. Question 8.
May 30, 2021 · Write an expression for the kinetic energy of an object. Answer. If a body of mass mis moving with a velocity v, then its kinetic energy E k is given by the expression, E k = 1/2 mv2. Its SI unit is Joule (J). 3. The kinetic energy of an object of mass, m moving with a velocity of 5 m s−1 is 25 J.
- Answer: Work is completed whenever the given conditions are satisfied: (i) A force acts on the body. (ii) There’s a displacement of the body caused by the applied force on the direction of the applied force.
- Question 4: A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
- Answer: Mass of the body = 20 kg. Initial velocity = 5 m/s. Final velocity = 2 m/s. We know that, The negative sign indicates that the force is acting in the direction opposite to the motion of the object.
- Question 12: Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Solution: Work is completed whenever the given conditions are satisfied: (i) A force acts on the body. (ii) There’s a displacement of the body by applying force in or opposite to the direction of the force. 2. Write an expression for the work done when a force is acting on an object in the direction of its displacement.
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Solution: (i) A force acts on the body. (ii) There’s a displacement of the body caused by the applied force on the direction of the applied force. 2. Write an expression for the work done when a force is acting on an object in the direction of its displacement. 3. Define 1 J of work.
