Analysis of Two Dimensional Projectile Motion
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The Galilean experiement virtually excluded the role of air resistance. A parachuting example, however, would take into account air resistance.
The heavier object will of course take a longer time to reach terminal velocity, because it exerts more force for air resistance to equalise (and air resistance is proportional to velocity/acc).
The small scale Galilean experiment is to the large scale parachuting example what Newtonian mechanics are to general relativity.
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However, since A has twice the mass of B, it resists accelerating twice as much as B. These two effects - A has twice the force, but it resists twice as much - cancel each other out, and A has the same acceleration as B in free fall!
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For an object in free fall, the net force on it equals its weight (the pull of gravity - the force exerted on it by the Earth) and its weight is proportional to its mass. In other words, if object A has twice the mass of object B, then A also weighs twice as much as B. If A weighs twice as much as B, then the Earth pulls on A twice as hard as it pulls on B, and the net force on A during free fall is twice as much as the net force on B.
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THANX so much...
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Awesome! I love it and your teacher does an awesome job... You as well with the slow-motion and little notes that you put on there. I love the explanations... and I agree!! Keep them coming!!
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keep em comin man
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I'm sorry but you've got the forumulation wrong. It's mass not weight. They will have the same weight regardless of their mass. The meaning of weight in physics is a little bit different than in real life.
F00dTube 3 years ago 3