Question

a sliding box is on a slanted surface as shown in the diagram. Calculate:I. work against gravity. II work against friction. III.total work done by the box​

Answer 1

Answer:

For calculating work done when friction is involved,

Total work done(W)is equal to Work done against friction(W

1

)+ Work done against gravity(W

2

)

Given:

Total work is done (W)=250J

Mass(m)=5kg

Therefore, Weight(w)=5×10=50N

Height(h)=4m

W=W

1

+W

2

⇒W=W

1

+(w×h)

⇒250=W

1

+50×4)

⇒W

1

=250−200

⇒W

1

=50

Hence work done against friction is 50J