Physics - Free Falling Objects

Say you are standing on the sidewalk and you look up to see a piano and a book falling. Which one is going to hit the ground first? Instinct tells us the piano would fall to the ground first because it is the heaviest, but surprisingly, that's just not true. Both objects will fall to the ground at the same time. Objects do not fall with uniform velocity; instead they fall with uniform acceleration. Free-fall acceleration occurs when an object is subject only to the force of gravity. This is something Galileo first experimented with when he dropped objects from the top of the Leaning Tower of Pisa.  In today's free Physics 1 video, you'll learn about the reality of Free-Falling Objects. Today's lecture even includes a great demo on air friction's impact on free-falling and a great example of how this knowledge can be used in the real world.