work done by the force can be ____, ____ and ____
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work done by the force can be zero positive or negative
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Work done by force can be positive, negative and zero.
What is work done?
- Work done by any force is given as dot product of force exerted on the body and the displacement of the body.
- Work done = Force * Displacement * cos θ
- where θ is the angle between direction of force and direction of displacement.
When is work done positive?
- For work done to be positive, the direction of force and displacement must be in the same direction.
- Then, θ is zero and so cos θ = 1, hence the work done is positive.
When is work done negative?
- For work done to be negative, the direction of force and displacement must be in the opposite direction.
- Then, θ is 180 degrees and so cos θ = -1, hence the work done is negative.
When is the work done zero?
- For work done to be zero, the direction of force and displacement must be mutually perpendicular to each other.
- Then, θ is 90 degrees and so cos θ = 0, hence the work done is zero.
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