Why your weight doesn't determine how fast you fall
In short: If you drop a flat sheet of paper and a crumpled ball made from the same sheet, the ball hits the ground first. This happens because gravity isn't the only force at play; air resistance creates a physical barrier that changes everything based on shape rather than mass.
To understand why objects fall at different speeds, we must distinguish between properties like weight and shape. A common misconception is that heavier objects always fall faster. However, if you take two identical sheets of paper—same color, size, and weight—and crumple one into a tight ball, the mass remains unchanged. Whether you are standing with your arms out or tucked in for a cannonball jump, your weight stays the same; only the space that weight occupies changes.
The reason the crumpled ball reaches the floor first is air resistance. As an object falls, it must physically move the air molecules out of its path. A large, flat sheet of paper has a wide surface area, forcing it to push against a significant volume of air as it descends. This creates high resistance, slowing the paper's progress significantly. In contrast, the crumpled ball presents a much smaller surface area, allowing it to displace only a small amount of air at once.
This experiment demonstrates that the speed of a falling object is dictated by how much air it must move out of the way. Objects with high surface areas are 'air resistant,' while compact objects are not. By testing different sizes of paper, you can observe this principle in action: the larger the surface area relative to its weight, the more the air resists its motion, resulting in a slower fall.
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Sources
- Summary by Intellect · source: How to Demonstrate Air Resistance | Science Projects
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