# The ballistic pendulum

What is the fractional loss in kinetic energy? History[ edit ] Ballistic pendulum The ballistic pendulum was invented in by English mathematician Benjamin Robins —and published in his book New Principles of Gunnery, which revolutionized the science of ballistics, as it provided the first way to accurately measure the velocity of a bullet.

The notched part of the ballistic setup could have had finer groves to yield more accurate measurements. What can one say about the momentum before and after the collision? Measure masses to 0. Find the percent difference between the two values for U. It explains the study of optical properties for different material by adopting laser devices and handling basic aspects of interferometry.

Written by Arturo I. Hint 1 - deflection of the pendulum How high does the pendulum hit by the bullet rise? Position the apparatus near the end of the table so that it is aimed out across the floor with a range of about three meters.

Put the gun back on the gun rod but do not cock it. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Calculate by dividing the loss by the original kinetic energy.

He used the period of oscillation and mass of the pendulum both measured with the bullet included to calculate the rotational inertia of the pendulum, which was then used in the calculations. Draw yourself a figure. When we were done this Method A, we moved onto Method B. Please enable iframes to use this feature.

In Method B, the projectile motion of the ball is studied to determine its initial velocity. The spring will break if you pull it backwards. This is a fairly significant difference, which suggests that there sources of error during the procedure. Leave the pendulum raised.

So we can set the two energies equal to each other, solve for velocity in the kinetic energy sideand plug the result into our expression above: The second, and more accurate method, was to directly measure the bullet momentum by firing it into the pendulum. For method B, we removed the pendulum bob and shot the ball off the table onto the floor, where we recorded the distance of the x axis from the table to the spot where the ball landed. Use equation 6 to find the initial velocity of the ball. This process was repeated five times in order to obtain average values to work with in order to eliminate error. The angle was measured every time the launcher was released for method A. Compare energies at the moment immediately before the collision 2 and at the moment the pendulum reaches the maximum deflection 3.

Make sure that the gun does not move.Ballistic pendulum: Ballistic pendulum, device for measuring the velocity of a projectile, such as a bullet. A large wooden block suspended by two cords serves as the pendulum bob.

When a bullet is fired into the bob, its momentum is transferred to the bob. The bullet’s momentum can be determined from the amplitude. A bullet with mass m hits a ballistic pendulum with length L and mass M and lodges in it.

When the bullet hits the pendulum it swings up from the equilibrium position and reaches an angle α at its maximum. Determine the bullet’s velocity. The ballistic pendulum is a device often found at well equipped shooting ranges. It is used to measure the speed of a bullet.

The operation of the ballistic pendulum is simple. A block of wood of known mass is suspended from length of rope, forming a pendulum. A bullet of known mass is fired horizontally into the block of wood.

In a ballistic pendulum an object of mass m is fired with an initial speed v 0 at a pendulum bob. The bob has a mass M, which is suspended by a rod of length L and negligible mass. After the collision, the pendulum and object stick together and swing to a maximum angular displacement θ as shown. Ballistic Pendulum The ballistic pendulum is a classic example of a dissipative collision in which conservation of momentum can be used for analysis, but conservation of energy during the collision cannot be invoked because the energy goes into inaccessible forms such as internal energy.

B Ballistic Pendulum/Projectile Launcher ® 1 Introduction The PASCO ME/ME Ballistic Pendulum/ Projectile Launcher (BPPL) has been designed for.

The ballistic pendulum
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