WAEC - Physics (2020 - No. 25)
The diagram illustrates a ball of mass m sliding down a plank inclined at an angle of 0 to the horizontal. The kinetic friction between the ball and the plank is F and acceleration of free fall is g. The normal force on the ball is?
mgsin \(\theta\)
mgtan \(\theta\), mgcos \(\theta\)
mgcos \(\theta\)
mgcot \(\theta\)
解释
The normal reaction/force on a body on a horizontal surface is R = mg; but that on a body on an inclined surface is R = mgCosθ.