1. The problem statement, all variables and given/known data The drawing shows a large cube (m=25kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (m=4kg) is in contact with the fron surface of the large cube and will slide downward unless P is sufficiently large. The coefficient of static friction between the cubes is 0.71. What is the smallest magnitude that P can have in order to keep the small cube from sliding downwards I know that the weight of the small cube is 39.2N. I also know that Fn is in the same direction as P. Past that, I'm confused. I have a equation: F=u*Fn, which is friction is equal to coef. of friction times normal force. Can someone explain to me what to do next?