If a much heavier stone rolled off the same cliff, would it hit the ground more quickly? explain

Why is there friction between objects

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's