Lesson: Static Friction High School Physics

A brick is initially at rest on top of a rough horizontal surface, as shown in the diagram. The brick is pushed by a force parallel to the surface and starts to move. The weight of the brick . What must the coefficient of static friction of the brick with the surface be less than?

The figure shows two blocks, block A and block B. Block A is on a rough surface, and block B is on block A. A force acts on block A, parallel to the surface. Initially, block A does not move, and is steadily increased. When has increased enough to make block A start to move, both blocks move in the direction of , but block A has a greater acceleration than block B. Which of the following is a correct statement about the relation of , the coefficient of static friction between block A and the surface, to , the coefficient of static friction between the blocks?

A brick is initially at rest on top of a rough horizontal surface, as shown in the diagram. The brick is pushed by a force parallel to the surface and starts to move. The coefficient of static friction of the brick with the surface is 0.75. What must the weight of the brick, , be less than?