In this experiment, students push two pennies off a table: one simply falls and the other is launched horizontally. Regardless of how far or fast the one penny is launched, both hit the ground simultaneously. This simple demonstration shows that horizontal speed and vertical acceleration are independent. This surprising fact is fundamental to understanding projectile motion. 

 

Concepts Addressed

  • All objects fall at the same rate.
  • Horizontal speed has no affect on vertical speed/falling.
  • Projectiles always fall with a parabolic motion.


Materials Needed per setup: Ruler, 2 similar coins

 

Prep Needed  Gather supplies

Teaching Time   20-30 min

 

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Force and Motion Study: Motion in Two Dimensions | Projectile Motion

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