Pfautz+Lab+11


 * LAB 11****- BALLISTIC PENDULUM RESEARCH**
 * Explain what a ballistic pendulum is, what it is used for, what measurements are required to be taken and what main physics principles are involved. Write your response in your own words and include links to your sources (following your response). Include at least 3 relevant pictures with explanation.

A ballistic pendulum, invented by Benjamin Robins, is a device for measuring an object’s momentum, usually a bullet. It is used to calculate the velocity and kinetic energy of an object as well as measure any transfer of momentum. In order to determine an object’s momentum with the use of a ballistic pendulum, one must first know the mass of the bullet, mass of the pendulum, the maximum height reached, and both the velocity of the bullet and pendulum. These are all put together into the formula for the law of conservation of mechanical energy of the pendulum: ½ (m+M) V²= (m+M) gh. With this device, it is also possible to confirm the law of conservation of momentum: mv = (M+m) V. The principles involved with the ballistic pendulum are momentum, kinetic energy, potential energy, inelastic collisions, and the law of conservation of momentum.

A ballistic pendulum.

A ballistic pendulum with the parts clearly drawn and labeled.

A sketch of a ballistic pendulum in action including equations and explanations.

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