Question

what is work in physics​

Answer 1

In physics, work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement.

In SI base units: 1 kg⋅m2⋅s−2

SI unit: joule (J)

Other units: Foot-pound, Erg

Derivations from other quantities: W = F ⋅ s; W = τ θ

Dimension: M L2 T−2

Answer 2

The Very Basic Definition :

A work ( W ) is defined as the amount of Energy released by a force ( F ) in moving a particle/object by a certain displacement ( x ).

That is, W = F*x

Since, Force is a vector quantity, we can't directly multiply it with 'x'. We shall use the scalar product to define it.

Hence, W = F(→).x(→) = F*x*cos(ø)

where F(→) is the force vectorz x(→) is the displacement vector and ø is the angle between the two above defined vectors.

Modified Definition ( in terms of Mechanical Energy) :

Work (W) is the change in Energy of a system. Work can also be defined as the "change" in total mechanical energy of a system. Let's assume that a system had an initial total energy 'Ei' and a final total energy 'Ef'. In this case, the work done is given by : W = Ef - Ei