The block lies on an inclined board. How does the static friction force acting on a bar depend on the angle between the board and the floor?
The greater the angle between the board and the floor, the greater the static friction force. Explanation: the greater the angle between the board and the floor, the smaller the angle between the perpendicular to the floor and the board, which means the greater the vector of gravity, which is trying to make the bar move towards the surface of the board. The static friction force in this case is a counterbalance to the force of gravity, and the larger the second, the more the first must be in order for the body to remain motionless. If the vector of gravity to the surface of the board becomes greater than the static friction force, then the bar will begin to move.
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