# lab 4 - BALLISTIC PENDULUM OBJECT To study the conservation...

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14 BALLISTIC PENDULUM OBJECT To study the conservation of energy and momentum in an inelastic collision between a ball and a pendulum bob. APPARATUS Blackwood ballistic pendulum, meterstick, steel rule, carbon paper. THEORY If a ball of mass m is launched with a velocity of v at a pendulum bob of mass m, the ball will lodge in bob and the combination ball and bob will have a velocity V. The pendulum then rises a height “h”. “h” is determined by subtracting the height of the center of mass before collision from the height of the center of mass after collision. The center of mass of the bob is located on the arm of the pendulum bob. (Examine the apparatus and find the black mark.) 1. Using the conservation of energy 2 1 (m + M) V 2 = (m + M) g h , the velocity (V) of the ball and bob after impact can be found. 2. Using the conservation of momentum v m = V (m + M) , and the velocity (V) from part 1, the velocity of the ball (v) can be found. Solve for the velocity of the ball in terms of

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## This note was uploaded on 08/25/2011 for the course PHYS 164 taught by Professor Johnjames during the Fall '09 term at MO St. Louis.

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lab 4 - BALLISTIC PENDULUM OBJECT To study the conservation...

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