Where F|| is the component in the direction of motion (or opposite if it is negative)
and F⊥ is the component perpendicular to the direction of motion. We can now
write this formula as W = F||d.
Questions 4-7A box slides down an inclined plane (incline angle = 40°). The
mass of the block, m, is 40 kg, the coefficient of kinetic friction
between the box and the ramp, mk, is 0.3, and the length of the
ramp, d, is 10 m. (Use: sin 40° ≈ 0.6 and cos 40° ≈ 0.8.)