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March 28, 2017

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A 14.7 kg crate is pulled up a rough incline
with an initial speed of 1.5 m/s. The pulling
force is 124.0 N parallel to the incline, which
makes an angle of 11.0

with the horizontal.
The coefficient of kinetic friction is 0.31 and
the crate is pulled a distance of 7.2 m.
The acceleration of gravity is 9.81 m/s
2
.
a) Find the work done by Earth’s gravity
on the crate.
Answer in units of J

  • physics - ,

    Fc = m*g = 14.7kg * 9.81N/kg = 144.1 N.=
    Force of crate.

    d = 7.2*sin11 = 1.37 m., Vertical.

    Work = Fc * d = 144.1 * 1.37=198 Joules.

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