The force which accelerates the dog is given by
F = mgsin(θ)
less friction, if any.
The force which presses on the plank (hence causes friction) is given by
N = mgcos(θ).
In the case of a frictionless plank, N does not matter.
A disconcerted dog of a mass 7.80 kg is sliding down a frictionless plank which is inclined at an angle of 48.0 degrees to the horizontal.
Calculate the force which accelerates the dog down the plank.
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