By the end of this section, you should . Be able to recognize situations involving friction in . . . A positive value for the symbol means guessed correctly. A positive value for the symbol means guessed incorrectly.
Friction always acts to prevent sliding motion between the surfaces at which it acts.
Be able to evaluate alternative types of impending motions, such as slipping and tipping, to determine which will occur first. Be able to analyze the forces in machine systems with belt friction.