Which of the following reasoning most accurately explains why the initial slope of a…
PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
Which of the following reasoning most accurately explains why the initial slope of a graph of static friction magnitude versus applied horizontal force equals 1?
(a) The normal force on a horizontal surface equals the applied horizontal force, so the ratio fs/Fapp is always 1 at small forces, producing a unit slope.
(b) Because static friction automatically adjusts to equal the applied horizontal force while the object remains at rest, so fs=Fapp; plotting one against the other therefore gives a straight line of slope 1 through the origin.
(c) The slope equals the coefficient of static friction μs, and because many surfaces have μs≈1, the initial slope is about 1.},{
(d) Because kinetic friction is less than static friction, the static-friction graph must start flatter than a 45∘ line, so the slope is less than 1.}