The following pairs of surfaces are pushed together with the same amount of force. Between which pair of surfaces will friction be the greatest?

Atwo pieces of sandpaper

Btwo pieces of waxed paper

Ca painted surface and a piece of sandpaper

Da painted surface and a piece of waxed paper

Juan and his friends want to build their own go-karts and race down their street. According to Newton’s Second Law of Motion, which of these will help Juan to win the race?

Aincreasing the mass of his go-kart

Bincreasing the amount of inertia the go-kart has

Cdecreasing the net force applied to the go-kart

Ddecreasing the mass of his go-kart