Understanding Forces: Analyzing Various Physical Scenarios Through Free Body Diagrams

FBD Practice

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

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

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

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

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

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

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

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

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

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

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

Understanding Forces: Analyzing Various Physical Scenarios Through Free Body Diagrams

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