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A 80 N crate Slides with the constant speed a distance of 5m downward along a rough slope that makes an angle of 30° with the horizontal The work done by the force of gravity is?
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Answer:
Weight of the crate is
W
=
80
N
.
Downward distance traveled by the crate along the slope is
d
=
5
m
.
Angle of the slope is
θ
=
30
∘
.
The expression of the work done by the gravitational force on the crate along the slope is
w
=
F
g
sin
θ
d
w
=
W
sin
θ
d
Where:
w
is the work done; and
F
G
is the gravitational force.
Substitute the values into the above equation.
w
=
80
sin
30
∘
×
5
w
=
40
×
5
w
=
200
J
Thus, the work done by the force exerted by gravity is
200
J
, so option
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