Section 8.1 Characteristics of Dry Friction IMPENDING TIPPING (page 390) page 1 W a / 2+-a / 2~1 P h F O 1 1 1 7 x N Resultant Normal and Frictional Forces (d) Figure: 08_001d Copyright @2013 Pearson Education, publishing as Prentice Hall
Section 8.1 Characteristics of Dry Friction IMPENDING TIPPING (page 390) page 2 · Figure 8-1 (d) Figure 8-1 (d) shows a uniform block of weight W in equilibrium on a rough horizontal surface. An applied force P acts on the block. The surface exerts a resultant normal force N on the block and a resultant friction force F . N acts a distance x to the right of the line of action of W . · Equations of equilibrium F = P · Criterion for no tipping The block will not tip if · Impending tipping N = W Wx= Ph x = Ph ! a Ph W 2 The block is on the verge of tipping when X = W 2 Ph _a This situation is called impending tipping.
Section 8.1 Characteristics of Dry Friction IMPENDING SLIDING (page 390) page 1 W +a / 2+-a / 2~ P 1 1 h F 0 x N Resultant Normal and Frictional Forces (d) Figure: 08_001d Copyright #2013 Pearson Education, publishing as Prentice Hall