Eli5 How do things stay on my bumper when driving

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I recently drove approximately 15 miles of highway and back roads. Upon my arrival, while opening my rear van doors, I noticed one of those heavy copper staples laying on my bumper. This isn’t first time I’ve seen this. Phenomenon. What keeps items on the bumper? Thank you in advance

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2 Answers

Anonymous 0 Comments

Look up some videos of cars in wind tunnels. The air flowing over your car is mostly going straight back off the trunk. There is no wind going straight down from the trunk to blow it off the bumper.

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