Define work? Give SI unit of work? Can you write an expression for positive work done?

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Answered by

Lalit Bhandari If I agreed with you, we'd both be wrong! | Guide-Level 15

9 years ago

Hi Ashish,
Work is the energy required to move an object against a force. Work is equal to the force times the distance the object moves. The SI unit for work is the joule.
In the case of a constant force, work is the scalar product of the force acting on an object and the displacement caused by that force. Though both force and displacement are vector quantities, work has no direction due to the nature of a scalar product (or dot product) in vector mathematics. This definition is consistent with the proper definition, because a constant force integrates to merely the product of the force and distance.
The SI units for work are the joule

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Answered by

Priyanka Kammar

8 years ago

Work is said to be done by the applied force if it point of application is displaced. SI unit is joule. If force acts upon the body such that energy of body increases then work done is positive
Work done = magnitude of scalar product of force and displacement.

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Answered by

Mohan chaudhary

7 years ago

It is the capacity of doing work.

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Answered by

deepak porje

8 years ago

Product of force and displacement in the direction of force is called as work done.
The SI unit for work is 'Joule'.

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Well, that's great, as you are preparing for JEE Advanced Physics. From my research, I would like to recommend some of the books and resources that will help you learn the basics and understand the concept:

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2. Understanding Physics Series by D.C. Pandey (Arihant)

3. Fundamentals of Physics by Halliday, Resnick and Walker

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1. Concept of Physics (Vol 1 and 2) by H.C. Verma

2. Understanding Physics Series by D.C. Pandey (Arihant)

3. Fundamentals of Physics by Halliday, Resnick and Walker

4. Problem in General Physics by I.E Irodov

5. Physics Galaxy by Ashish Arora.

6. Previous Year Question Book (likee PW 48 Years/Oswaal JEE Advanced Paper)

The first book to read would be 'Concepts of Physics (vol 1 and 2)' by H.C. Verma Why you should read this book first: because it will build strong basics, and you will understand the concept easily. This book explains each and every topic in simple language and helps you to learn problems step by step.

After that, you can read the 'Understanding Physics Series' by D.C. Pandey (Arihant). This book is divided into 5 parts (Mechanics 1, Mechanics 2, Waves and Thermodynamics, Electricity and Magnetism, and Optics and Modern Physics). This book has a lot of JEE Main and Advanced level questions that will help you to practice every type of problem.

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The fourth book you can read is 'Problem in General Physics' by I.E. Irodov. This book has one of the toughest problems for JEE Advanced. This book helps you to develop speed and accuracy.

The fifth book you can read is 'Physics Galaxy' by Ashish Arora. This book covers all the conceptual gaps that you will not find in other books and contains advanced illustrations and tricky problems.

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I hope this will help.

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