GCSE Physics Question Analysis Topic: Physics - Work
Exam Question: In which situation is no work done?
An object moves when a force is applied to it, and the force also does work in such a case. If the applied force does not cause the object to move, then it can be said that no work is done.
Physics defines work as the result of the applied force and the object's displacement.
If cos θ is zero, or θ = π / 2, work is zero i.e. no work is done.
End of analysis. Great!