A block is pulled along a horizontal bench at a constant velocity of 10 ms-1 by a force of 5 N. What is the work done against friction in 4 seconds ?
Steps are required thx !
Work done
2007-03-05 6:39 am
回答 (2)
2007-03-05 6:45 am
✔ 最佳答案
A block is pulled along a horizontal bench at a constant velocity of 10 ms-1 by a force of 5 N. What is the work done against friction in 4 secondsDisplacement s = v t
= 10 x 4
= 40m
Work done W = F s
= 5 x 40
= 200J
2007-03-05 10:24 am
the total power generated against the frictional force
=F x v
=5 x 10
=50 W
so the work done against friction
=P x t
=50 x 4
=200 J
=F x v
=5 x 10
=50 W
so the work done against friction
=P x t
=50 x 4
=200 J
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