A block of wood weighing 150g rests on an inclined plane. The question asks to find a) the greatest angle the plane can be tilted without the block slipping, and b) the force parallel to the plane needed to prevent slipping when the angle is 300. The document also provides a second problem about a 5kg box pulled along a level floor by a 10N force rope at a 300 angle, asking for the coefficient of sliding friction between the box and floor.