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 the acceleration of free fall is g. The normal force on the ball is?
Attached Figure / Diagram
A
mgsin \(\theta\)
B
mgtan \(\theta\), mgcos \(\theta\)
C
mgcos \(\theta\)
D
mgcot \(\theta\)
Verified Correct Answer: C.
Physical Principles & Numerical Solution
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 = mgCos\theta.
Source: Myschool Past Questions Archive (Record #59449)