Question

work done by the force can be ____, ____ and ____​

Answer 1

Answer:

work done by the force can be zero positive or negative

Answer 2

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.