List five situations in which a lesser amount of friction would be beneficial. overall, would a high or low coefficient of friction be in these situations?

1).  between parts of machine during Relative motion

2).  Rowing a boat in water

3). moving heavy mass on the surface

4).  Flying of aeroplane

5).  Transfer of liquid through pipe

Explanation:

As we know that friction resist the relative motion of two surface with respect to each other.

So here we require less friction in all above cases as we would like to transfer surface on another surface

Here we know that friction force is given as

so here in order to reduce the friction we need to decrease the value of coefficient of friction.

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r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.