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Newton's Laws Name: Free-Body Diagrams Read from Lesson 2 of the Newton's Laws chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/newtlaws/u2l2b.cfm http://www.physicsclassroom.com/Class/newtlaws/u2l2c.cfm MOP Connection: Newton's Laws: sublevel 5 Construct free-body diagrams for the following physical situations. Label all forces (e.g, Fgrav, Fnorm, Fapp, Ffrict, Fair, Ftens, etc. ). a. A physics book rests upon a level table. b. Fnorm A skydiver is falling and has reached a c. A large crate is being pushed leftward at a constant velocity. Fair Ffrict Fgrav Fgrav Fnorm Fapp Fgrav terminal velocity. d. A sledder has reached the bottom of a hill and is coasting rightward while slowing down. e. A ball is moving upwards towards its peak. Ignore air resistance. f. An air track glider moves rightward at constant speed. Fair Fnorm Fgrav Fgrav "Coasting" indicates constant v. g. The brakes are applied to a rightward moving car and it skids to a stop. Fgrav NOTE: An upward force is not required. h. A spider is slowly descending a thin silk thread at constant speed. Technically, the up force is air resistance and not Fnorm. i. A projectile is moving upwards and rightwards towards the peak of its trajectory. Ftens Fnorm Ffrict Fgrav j. An elevator is rising at a constant velocity; it is not touching the elevator shaft. Ftens Fgrav © The Physics Classroom, 2009 Fgrav Fgrav (For projectiles, there is no Fair.) k. An upward rising elevator is slowing down; it is not touching the elevator shaft. Ftens Fgrav l. A force is applied to accelerate a crate across a rough horizontal surface. Ffrict Fnorm Fapp Fgrav Page 1 Newton's Laws © The Physics Classroom, 2009 Page 2