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कार्य ऊर्जा, शक्ति और गुरुत्वाकर्षण, दिशा प्रकाशन द्वारा : जेईई मेन और उन्नत परीक्षा हेतु पीडीऍफ़ बुक | Work Energy, Power and Gravitation by Disha Publication : For JEE Main and Advanced Exam PDF Book

कार्य ऊर्जा, शक्ति और गुरुत्वाकर्षण, दिशा प्रकाशन द्वारा : जेईई मेन और उन्नत परीक्षा हेतु पीडीऍफ़ बुक | Work Energy, Power and Gravitation by Disha Publication : For JEE Main and Advanced Exam PDF Book


Work-Energy-Power-and-Gravitation-by-Disha-Publication-For-JEE-Main-and-Advanced-Exam-PDF-Book


Name of Book :  Work Energy, Power and Gravitation / कार्य ऊर्जा, शक्ति और गुरुत्वाकर्षण 

Hope This Work Energy, Power and Gravitation Book will Step up you to Succeed / आशा करते हैं कार्य ऊर्जा, शक्ति और गुरुत्वाकर्षण पुस्तक आपके कदम सफलता की ओर ले जायगी

Language of Book : English

Size of Ebook : 12.3 MB

Total pages in ebook : 166

Ebook Downloading Status  : Best 
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Description about eBook : Work done by internal forces : Internal work
Let us consider a compressed spring is put in between two blocks and then placed on smooth surface. The blocks start moving away from each other. The forces acting on the blocks are; their weights W1 and W2, the upward reactions N1 and N2 exerted by the ground and internal force Fi. The work done by N1, N2, W1 and W2 are zero because they are perpendicular to the displacements of the blocks. But the kinetic energy of the blocks will increase. Here work, being zero, is not equal to the increase in kinetic energy of the system. Here the new situation arises that the different parts of the system can move in relation to each other and thus can do work on each other, even in the absence of any interaction with externally applied forces. Such work is called internal work. Although internal forces play no role in accelerating the composite system, but their points of application can move so that work is done; thus the kinetic energy of blocks change even though the external forces do no work.............

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