11. Work and Energy-Work formula by Scientifically and Mathematically Science Class 9 In English-CBSE Notes
Last Updated : 22 March 2026
Explore science cbse notes for Class 9 Chapter 11. Work and Energy Topic Work formula by Scientifically and Mathematically in English medium for exams preparation.
11. Work and Energy-Work formula by Scientifically and Mathematically Science Class 9 In English-CBSE Notes
Last Updated : 22 March 2026
11. Work and Energy-Work formula by Scientifically and Mathematically Science Class 9 In English-CBSE Notes
11. Work and Energy
Work formula by Scientifically and Mathematically
Positive Work, Negative Work and Zero Work
Equation of Work:
Mathematically work is expressed by the following equation.
W = F . S . cos θ
F = force, S = displacement, θ is the angle between force vector and displacement vector.
There are three situation for work done:
Positive Work: Work done is positive when the force is in the
direction of displacement.
Example of positive work:
The baby has exerted a force in the direction of displacement of the car. In this situation, the work done will be equal to the product of the force and displacement. In such situations, the work done by the force is taken as positive.
Zero Work: When after applying an amount of force but there is no displacement. Then the angle between these two vectors is 90o.
Example: A large and heavy rock is moved by applying force but no displacement noticed, in this case work will be calculate zero.
Negative Work: Work done is negative when the force acts
opposite to the direction of displacement.
Consider a situation in which an object is being displaced by the action of forces and we identify one of the forces, F acting opposite to the direction of the displacement s, that is, the angle between the two directions is 180º. In such a situation, the work done by the force, F is taken as negative and denoted by the minus sign. The work done by the force is F × (–s) or (–F × s).
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NCERT Solutions for Class 9 science Chapter 11. Work and Energy Topic Work formula by Scientifically and Mathematically
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About Chapter 11. Work and Energy of Class 9 science
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11. Work and Energy-Work formula by Scientifically and Mathematically Science Class 9 In English-CBSE Notes
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