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11.1.3 WORK DONE BY A CONSTANT FORCE How is work defined in science? To understand this, we shall first consider the case when the force is acting in the direction of displacement. Let a constant force, F act on an object. Let the object be displaced through a distance, s in the direction of the force (Fig. 11.1). Let W be the work done. We ...
- Work
- Energy
- Potential Energy
- Law of Conservation of Energy
- Power
Work done on an object is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. W = F.s. The SI unit of force is Newton. If a force acting on a body causes no displacement, the work done is 0. For example, pushing a wall. The force component F cos θ gives the component of force a...
Energy is defined as the ability to do work. Its unit is the same as that of work. Energy is a scalar quantity. SI unit of energy or work = Joule (Nm) or Kgm2s−2.
Energy can get stored in an object when work is done on it. For example, stretching a rubber string. The energy that is possessed by a body by virtue of its configuration or change in position is known as Potential Energy.
Law of conservation of energy states that energy can neither be created nor destroyed but can be transferred from one form to another. The total energy before and after the transformation remains constant. Total energy = KE + PE where, 1/2 mv2+ mgh = constant For example: consider a ball falling freely from a height. At height h, it has only PE = m...
The rate of doing work or the rate of transfer of energy is called power. It is denoted by P ⇒ P = SI unit is Watt (Js−1). Average power = Total energy consumed/Total time taken
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NCERT Solutions Class 9 Science Chapter 11 Work And Energy contain answers to the textbook questions as per the syllabus of the CBSE exam. Download Class 9 Science NCERT Solutions Chapter 11 Work And Energy in PDF format by visiting BYJU'S.
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Free NCERT Books download for Class 9 Science Chapter 11 - Work and Energy on Vedantu.com. Students can also download the NCERT Book Solutions in PDF for Class 9 Science Chapter 11 - Work and Energy. Register for Science tuition to clear your doubts and score more in your exams.
You can read and download Class 9 Science Chapter 11 PDF from this page of aglasem.com. Sound is one of the many lessons in NCERT Book Class 9 Science in the new, updated version of 2023-24.
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NCERT Solutions for Class 9 Science Chapter 11 Work and Energy. Exercise-11.1. 1. 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. What is the work done in this case? Solution:
