Question

All of the following show friction as a useful force, except _____.
a) the heat energy produced when two surfaces rub together.
b) having to push a rough and heavy box across the floor to move it.
c) the friction between your feet and the floor keeping you from slipping.
d) the tread on tires helping the moving vehicle slow down and stop when necessary.
(10 POINTS)

Answer 1

part a is right answer

Answer 2

b ) This option does not show friction as being useful because due to friction the person moving the box has to put a lot of force in moving it , if there was n friction the box would have moved smoothly