the purpose of fuses and circuit breakers is (first answer)
Given :
A 120 kg box is on the verge of slipping down an inclined plane with an angle of inclination of 47º.
To Find :
The coefficient of static friction between the box and the plane.
Solution :
Vertical component of force :

Horizontal component of force(Normal reaction) :

Since, box is on the verge of slipping :

Therefore, the coefficient of static friction between the box and the plane is 1.07.
Hence, this is the required solution.
Sorry I had the answer but it wont let me type numbers :(.:
False, as an object falls its potential energy turns into kinetic energy thus decreasing the potential energy.