There are two bricks on a wood board. One brick is laid on its long narrow side (face) and another one is laid on its wide side. The bricks weigh the same. What is the first brick slip off, if we will tilt the board?
Solution. Posted on Saturday, November 8, 2014.
The force which prevent slipping of the bricks is a static friction force. The maximum force of static friction depends on the normal force and on the coefficient of friction. Both the normal force and the coefficient of friction bricks are same. Thereby, bricks will slip at the same time.