Question

(a) Define work. Give SI unit of work. Write an expression for positive work done. (b) Calculate the work done in pushing a cart through a distance of 50 m against the force of friction equal to 250 N. Also state the type of work done. (c) Sarita lives on 3rd floor of building at the height of 15 m. She carries her school bag weighting 5.2 kg from the ground floor to her house. Find the amount of work done by her and identity the force against which she has done work (g = 10 ms–2)

Answer 1

a) the work expanded by a force of one newton through a displacement of one meter. its unit is joules which is represent as (J).   if the force has a component in the same direction as the displacement of the object, the force is doing positive work.

b) s=50m

f=250n

w=s×f

w= 50×250

  = 12500J

it is positive work done.

c)Mass,m=5.2 kg

Acceleration due to gravity,g=10 m/s2

Displacement,h=15 m

Work done=mgh

                 =5.2*10*15

                 =780 J.

She has done work against the gravitational force of earth.

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Answer 2

Answer:- Work is said tb done if a force of one Newton actually

displaces by 1 metre.