Correcting the Teacher: A Bullet's Time of Fall

by
posted on November 30, 2012
bs_2015_fs.jpg (26)

The Myth

A bullet dropped from a rifle's bore will hit the ground at the exact same time as a bullet fired from its bore.

The Origen
If you've taken high school physics, you've probably heard your teacher use this example to illustrate the counter-intuitive forces and acceleration of mass. The theory goes that if a bullet is dropped from the exact height of a rifle's bore at the exact same time a bullet is fired from the barrel parallel to the ground, the two equal-sized projectiles will strike the ground at the exact same time, despite the fact that the one that is fired will have traveled a much greater (horizontal) distance. The problem with this analogy is that it is not exact. Therefore it is wrong.

The Facts
According to the NRA Firearms Fact Book, "This would be quite true if the experiment took place in the airless environment of outer space. On the surface of the earth, where most of us do our shooting, however, the additional force of air drag must be taken into account. If air drag were directed only horizontally, it would make no difference to the speed with which the bullet falls. But because of the downward curve of the bullet's flight, and the fact that its point usually does not lie exactly in the direction of its flight, the drag has a slight upward component that resists the bullet's fall. So the horizontally-fired bullet in a resisting medium of air take a little longer to reach the ground than a slugged dropped from the muzzle."

The Smart-BS Answer
"Actually, sir, while you are correct in theory, the nerds at the NRA say the fired bullet would actually strike the ground slightly after the dropped bullet. In fact, in order for your oft-repeated theory to be true, you'd either have to be from Mars—and I wouldn't doubt it if you were—or you would have to be talking in approximations, in which case perhaps hand grenades, rather than bullets, is your bag. Sir."

Latest

R44 Lede (1)
R44 Lede (1)

Review: Magpul R44 DAKA Hard Case

Associate Editor David Herman tries out the new R44 DAKA Hard Case from Magpul, to see if its the right choice for hard-travelling hunters.

Top 5 Riflescope Mounting Systems

Your riflescope mounting system is just as important as the rifle, ammo and optic. All must work in concert to deliver a repeatable system. Here’s a look at five great systems.

Behind the Bullet: .35 Remington

How did a cartridge developed for an autoloading rifle come to be one of our most revered lever-action cartridges? We take a closer a look at the .35 Remington.

First Look: X-Vision Optics Beyond Thermal Binos

X-Vision Optics has introduced the Beyond Series of Thermal Binoculars, specifically tailored to the needs of avid hunters who require both durability and clarity.

Review: Aero Precision SOLUS Hunter

Those looking for a well-built rifle that is rugged, dependable and utterly accurate ought to give the Aero Precision SOLUS Hunter a look.

#SundayGunday: Beretta BRX1

Get a closer look at the Beretta BRX1, the latest addition to our #SundayGunday series.

Interests



Get the best of American Hunter delivered to your inbox.