what is the example of the use of a ballistic pendulum in a forensic investigation?

Question

what is the example of the use of a ballistic pendulum in a forensic investigation?

Answer 1

A ballistic pendulum is basically a mass at the end of a pivot arm, like any other pendulum. But a ballistic pendulum is special because the mass is designed to absorb a bullet shot at it. You fire a bullet at the pendulum, and then the pendulum (which now includes the bullet) swings up. When the bullet collides with the pendulum, energy of motion is not conserved because some of the energy becomes heat, noise, and deformation energy. However, momentum is conserved. Then, after the collision, the pendulum swings up and energy is conserved in this stage. So measuring the height of the pendulum's swing can be used to determine the gravitational potential energy at this point, which can be used to calculate the kinetic energy at the pendulum's rest point, which can be used to calculate the initial velocity of the pendulum/bullet combination, which can be used (via conservation of momentum) to calculate the original velocity of the bullet.

The ballistic pendulum would be used to determine the velocity of different types of bullets under various types of conditions, in recreations of shooting incidents. However, modern chronographs can directly measure the speed of an artillery projectile, making the ballistic pendulum obsolete. It remains useful, however, for demonstrating properties of physics.

Answer 2

A ballistic pendulum is used to measure the momentum of a bullet, from which can be measured the bullet's speed and energy. The bullet is shot at the pendulum and then you measure how far the pendulum swings. From that you calculate how much force the bullet had on the pendulum.

Sorry, the math is beyond me. 8^)

Answer 3

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