Question

suggest any two situation in which the work done by a force is zero​

Answer 1

1. When body is at rest

2. When car is moving in a uniform speed

Answer 2

Answer:

Situations in which the work done by a force is zero:

1. Sleeping for several hours.
2. Holding a bag in which no displacement occurs so work done on the bag is zero.
3. If we push wall, there is no displacement. So, work done by force is zero.

Explanation:

Conditions in which work done by force is zero.

1. When the displacement is zero:

• W = Fs cos θ
• So, when displacement ( cosθ = 0) is zero, W = 0

2. When the force is zero:

• W = Fs cos θ
• So, when Force ( F = 0) is zero then, W = 0

3. When the force and displacement is perpendicular:

• W = Fs cos θ
• If θ = 90° then cos θ= cos 90° = 0
• So, W = 0.

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