Simultaneous Fall


Simult3Two balls simultaneously dropped and projected horizontally hit the floor together because horizontal and vertical motion are independent of each other.



Principles Illustrated

Free fall, independence of horizontal and vertical motion.

NCEA & Science Curriculum

PHYS 2.4


With just a bit of practice an adequate job of this can be done with two golf balls. As students to predict which one hits the ground first, perhaps using the cards.

See the web site at Wake Forest University for a good example of this demo.
Link_Wake Forest Univ Simultaneous Fall Demo


Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.

Related Resources

Teaching Resources

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This teaching resource was developed with support from

The MacDiarmid Institute
Faculty of Science, Victoria University of Wellington
School of Chemical and Physical Sciences, Victoria University of Wellington


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