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Foot Pounds Energy Formula:
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Foot Pounds Energy (Ft-lb) is a unit of measurement used to quantify the kinetic energy of a projectile, such as a bullet. It represents the amount of work required to exert a force of one pound-force through a displacement of one foot.
The calculator uses the foot pounds energy formula:
Where:
Explanation: The formula calculates kinetic energy by taking the product of mass and velocity squared, divided by a constant that converts grains and ft/s to foot-pounds.
Details: Calculating foot pounds energy is essential for understanding a bullet's stopping power, penetration capability, and overall effectiveness for hunting, self-defense, and ballistic analysis.
Tips: Enter bullet mass in grains and velocity in feet per second. Both values must be positive numbers to calculate valid results.
Q1: Why is foot pounds energy important for shooters?
A: It helps compare different ammunition types and determine which load provides optimal performance for specific applications like hunting or target shooting.
Q2: What is a good ft-lb value for hunting?
A: This varies by game size, but generally 1000-1500 ft-lb is suitable for deer, while larger game may require 2000+ ft-lb.
Q3: How does velocity affect energy more than mass?
A: Because energy is proportional to velocity squared, doubling velocity quadruples energy, while doubling mass only doubles energy.
Q4: Are there limitations to this calculation?
A: This formula provides theoretical energy at the muzzle; actual energy downrange will be lower due to air resistance and other factors.
Q5: Can this formula be used for arrows or other projectiles?
A: Yes, with appropriate unit conversions, the same kinetic energy principle applies to any projectile.