Misconceptions about falling objects
Do heavy objects fall faster than lighter objects? What do you think? Why do you think that? What role does mass play, and what role does air play?
Think about how the acceleration of falling objects relates to Newton's 2nd Law (Fnet = ma).
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We saw these balls of different weights land at the same time, but we have many experiences in our life that are counter to this. Most people think that the heavy ball will land first because a light piece of paper falls slower than a rock. Discuss the role air plays in this.