Question

define work state SI unit of work . claculate the work done in pushing a cart through a distance 4 m against the force of friction equal to 150 N . also state the type of work done

Answer 1

work is said to be done only when the force applied on a body makes the body move (i.e. there is a displacement of a body )
ts SI unit is joule
here is a calculation

W = F×S
W = 150 N× 4 m
W= 620 J
the type of work done is positive work

Answer 2

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.