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Class 10 > Learn Class IX-X Tuition > Why workdone in physics is positive, negative and zero...
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Why workdone in physics is positive, negative and zero although it is scalar quantity?

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1. Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work. 2. In other words, work done...
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1. Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work. 2. In other words, work done due to displacement caused by a force is a scalar quantity. The dot product of vector quantities is always scalar which means it is has only magnitude and no direction. read less
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Tutor for Engineering and Physics

Definately work is an scaler quantity but in order to show whether work is done on the system or work is done by the system we use sign convention as -ve and+ve respectively
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Tutor

The work done is positive in sign whenever the force or any component of it is in the same direction as the displacement ; one then says that work is being done by the agent exerting the force and on the moving body. The work is said to be negative whenever the direction of the force or force component...
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The work done is positive in sign whenever the force or any component of it is in the same direction as the displacement ; one then says that work is being done by the agent exerting the force and on the moving body. The work is said to be negative whenever the direction of the force or force component is opposite to that of the displacement; then work is said to be done on the agent and by the moving body. However, the work done by gravity is negative, and the net (or total) work done is zero if the object is motionless both before and after the process of lifting it. remember---work is energy and energy is scalar so work is a scalar quantity.it is force which is a vector quantity read less
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If displacement of object is in the direction of force then work done is +,if work done is in the opposite direction of force then work dine is. Negative and if force is applied perpendicular to the displacement. Then work done is 0
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A good tutor and student freindly.

This positivity and negativity does not show the direction of work rather it shows the direction of force and displacement relative to each other.
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Computer engineer

Work is the dot product of the force and displacement, therefore the sign of the work depends on the angle between the force and the direction of movement, or more precisely, the sign of the cosine of that angle. If the force is in the same direction as the motion, then the angle is zero, the cosine...
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Work is the dot product of the force and displacement, therefore the sign of the work depends on the angle between the force and the direction of movement, or more precisely, the sign of the cosine of that angle. If the force is in the same direction as the motion, then the angle is zero, the cosine of zero is one, and the work done is positive. If it's in the opposite direction, the cosine of 180 is -1, and the work is negative Reference https://www.physicsforums.com/threads/should-work-done-be-written-as-negative-value.518396/ read less
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Teacher

W = F S Cosθ
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math navigator

Vector gives the direction as well, for eample: velocity is vector because it depends on the direction. But here the positive, negative and zero work done is with respect to the system, i.e. work done on the system or by the system. The work done here does not depend on the direction and again solely...
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Vector gives the direction as well, for eample: velocity is vector because it depends on the direction. But here the positive, negative and zero work done is with respect to the system, i.e. work done on the system or by the system. The work done here does not depend on the direction and again solely depends whether it's the system which is doing the work or is it the surroundings that is doing work on the system to account for the conservation of energy. read less
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