A wooden box of mass 10kg slides down a 30° incline of length 8m with a constant speed. What is the work done by the friction force?
Options
A
-400 J
B
-800 J
C
-692.82 J
D
-1385.64 J
Answer & Analysis
Answer
A
Analysis
We are given:
Mass of the box, ,
Angle of the incline, ,
Length of the incline, ,
Gravitational acceleration, .
The box is moving at constant speed,
meaning the net force along the incline is zero. This implies that the force of
friction is exactly balancing the component of the gravitational force acting
parallel to the incline.
Calculate the component of gravitational
force along the incline
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