Question

Suppose that you changed the area of the bottom surface of the friction cart without changing its mass, by replacing the Teflon slab with one that was smaller but thicker. The contact area would shrink, but the normal force would be the same as before. Would this change the friction force on the sliding cart

Answer 1

in this case the weight of the vehicle does not change , consequently the friction force should not change

Step-by-step explanation:

The friction force is a macroscopic manifestation of the interactions of the molecules between the two surfaces, this force in the case of solid is expressed by the relation

fr = μ N

W-N= 0

N = W

as in this case the weight of the vehicle does not change nor does the Normal one, consequently the friction force should not change