Work Energy and Power
2.0 Work done by a constant force
2.0 Work done by a constant force
Let us consider a man pulling a block of mass $m$ with a constant force $F$. Due to this force, the body undergoes a displacement along the horizontal direction as shown in the figure.
As only the horizontal component (i.e. $F = \cos \theta $) of the force is responsible for displacement along horizontal direction.
Work done,$$W = (F\cos \theta ) \times s$$ or $$W = Fs\cos \theta $$ $$W = \overrightarrow F .\overrightarrow s $$
Therefore, work done is defined as the dot product of force and the displacement.
