Define work , power and Energy . State their S.I . Units .

Explanation

Work : The product of force and displacement along the direction of force is called work
Work done `W=bar(F).bar(S)`
`=|bar(F)||bar(S)|costheta`
S.I . Unit of work is Joule .
Dimensional formula : `ML^(2)T^(2)`.
Power : The rate of doing work is called power .
Power= `("Work done")/("time")=(W)/(t)`
S.I. unit : Watt ,
D.F : `ML^(2)T^(-3)` .
Energy : It is the capacity or ability of the body to do work .By spendig energy we can do work or by doing work energy contentment of the body will increase .
S.I . unit : Joule , D .F . : `ML^(2)T^(-2)`