All of the following show friction as a useful force, except
the heat energy produced when two surfaces rub together
having to push a rough and heavy box across the floor to move it
the friction between your feet and the floor keeping you from slipping
the tread on tires helping the moving vehicle slow down and stop when necessary
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flying squirrels and sugar gliders are similar in terms of their size, fur, big eyes, white belly and capability to glide from treetops using a thin piece of skin that is stretched between their legs. nevertheless, they differ in locations since sugar gliders live in australia and flying squirrels live in north america and sugar gliders are marsupial mammals and flying squirrels are placental mammals.   biologists have figured out that sugar gliders and flying squirrels are probably not very closely related as the result in studying their genes and other traits. so in this case, if flying squirrels were brought to australia, probably, they’d compete with sugar gliders for resources.