Author: Khan Academy via YouTube
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If two objects are dropped from the same height in a vacuum, they accelerate at the same rate and hit the ground at the same time. This happens because an object’s gravitational mass is equal to its inertial mass. As a result, any object in free fall near Earth’s surface accelerates at 9.81 m/s/s. The gravitational force acting on an object is not always equal to its weight. A free falling object experiences a gravitational force, but also appears weightless because there is no normal force pushing up on it.

Sections:
00:00 – Intro
00:26 – Free fall
02:31 – Air resistance
03:55 – Falling motion with air resistance
05:19 – Free fall vs falling through air
05:36 – Weightlessness
08:46 – Projectile motion

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