Newton’s first law said that without an external force input,an object will either stay still or move at a constant velocity forever.Aaryan34532 said:
Why?Aaryan34532 said:
Is it?
Why not?
Correct.Aaryan34532 said:
In physics, work is defined as the product of force and displacement. If there is no displacement, then the work done is zero. This means that the applied force is either zero or perpendicular to the direction of displacement, resulting in no work done.
When work is zero, it means that there is no transfer of energy from one form to another. In other words, no energy is being added or subtracted from the system. This could be due to the lack of motion or the absence of an external force.
Yes, it is possible for work to be zero even when there is movement. This can happen when the applied force is equal and opposite to the frictional force, resulting in no net work being done. In this case, the object may still be moving at a constant velocity, but the work done is zero.
No, zero work is not always a bad thing. In some cases, zero work can be desirable, such as in magnetic levitation or when trying to maintain a constant speed. However, in other situations, zero work may indicate that the system is not functioning as intended or that there is a lack of efficiency.
If the work done is zero, it means that the applied force is perpendicular to the displacement. In this case, the work can be calculated using the formula W = Fdcosθ, where θ is the angle between the force and displacement vectors. Since cos90° = 0, this results in zero work. Alternatively, if the work done is zero, it can also be stated that the net force acting on the object is zero, and therefore, the work can be calculated using the formula W = ΔK = 0.
