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FBD Practice

FBD Practice. 1. Book at rest on table. F N. Σ F y = ma y F N – F g = 0. F g. 2. Girl holding rope. T. Σ F y = ma y T – F g = 0. F g. 3. Free Falling Egg. Σ F y = ma y – F g = ma y. F g. 4. Book accelerating to right. Σ F y = ma y F N – F g = 0 Σ F x = ma x

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FBD Practice

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  1. FBD Practice

  2. 1. Book at rest on table FN ΣFy = may FN – Fg = 0 Fg

  3. 2. Girl holding rope T ΣFy = may T – Fg = 0 Fg

  4. 3. Free Falling Egg ΣFy = may – Fg = may Fg

  5. 4. Book accelerating to right ΣFy = may FN – Fg = 0 ΣFx = max FA – f = max FN FA f Fg

  6. 5. Book across desk at constant v ΣFy = may FN – Fg = 0 ΣFx = max FA – f = max FA – f = 0 FN FA f Fg

  7. 6. Sled with acceleration left ΣFy = may FN – Fg = 0 ΣFx = max f - FA = max FN FA f Fg

  8. 7. Football near peak of flight ΣFy = may – Fg = may Fg

  9. 8. Car coasting right but slowing down ΣFy = may FN – Fg = 0 ΣFx = max – f = max FN f Fg

  10. 9. Shopping cart with 40° push down and to right moving at constant speed ΣFy = may FN – Fg – FAsin40 = 0 ΣFx = max FAcos40 – f = max FAcos40 – f = 0 FN f 40 ° FA Fg

  11. 10. Sled accelerated left by pull at 30° above horizontal ΣFy = may FN – Fg + FAsin30 = 0 ΣFx = max -FAcos30 = max FA FN 30° Fg

  12. Try it… • 1. A shuffleboard puck slowing to a stop as it slides across the court • 2. A crate pulled at a constant speed to the left by a rope that makes a 25 degree angle with the horizontal

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