SPM Physics:AHA! Force Challenge- See the Invisible Arrows!

 

Ordinary eyes see objects. Physics eyes see forces. This comic shows how scientists use Free Body Diagrams (FBDs) to visualize the invisible arrows acting on objects:

• Book on table: Normal force $F_n$ vs gravitational force $F_g$.

• Hanging object: Tension $T$ vs weight $F_g$.

• Falling egg: Only weight $F_g$.

• Plane at constant velocity: Lift, air resistance, applied force, and weight.

The exam keyword is clear: forces acting ON the object, not forces exerted BY the object.

AHA! Draw the arrows, reveal the truth. Not by sight, but by INSIGHT!

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