Falling objects | Physics | Khan Academy

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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[TrishaJane]

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[rhoshiniselvanatarajanmuda]

What has to be the minimum height from which the ball has to be dropped such that air resistance compensates gravitational force in order to bring the netforce to zero

[rhoshiniselvanatarajanmuda]

4:49 ; at what time the air resistance of the ball will be equal to the force of gravity?

[isabel]

I wish these videos were in Spanish so I could show them to my son