Sally applies a total force of 299 N with a
rope to drag a wooden crate of mass 100 kg
across a ﬂoor with a constant acceleration in
the x-direction of a = 0.1 m/s
2
. The rope tied
to the crate is pulled at an angle of θ = 59
◦
relative to the ﬂoor.
m
Calculate the total work done by friction as
the block moves a distance 21.8 m over the
horizontal surface. The acceleration due to
gravity is 9.8 m/s
2
.
Answer in units of J

Question

Sally applies a total force of 299 N with a
rope to drag a wooden crate of mass 100 kg
across a ﬂoor with a constant acceleration in
the x-direction of a = 0.1 m/s
2
. The rope tied
to the crate is pulled at an angle of θ = 59
◦
relative to the ﬂoor.
m
Calculate the total work done by friction as
the block moves a distance 21.8 m over the
horizontal surface. The acceleration due to
gravity is 9.8 m/s
2
.
Answer in units of J

anonymous · Answer

Do you need help to do it or want an answer? 3140J is what I get..

anonymous · Answer

i would like how you got the answer too, apparently its really simple but i guess im just missing it

anonymous · Answer

I have to go for lunch, back in 30mins or so if nobody else helps before then. is the answer right..?!

anonymous · Answer

So, first thing is a free body diagram:
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