Free fall, independence of horizontal and vertical motion.
NCEA & Science Curriculum
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.
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