Principles of Mechanics by Salma Alrasheed

Author:Salma Alrasheed
Language: eng
Format: epub, pdf
ISBN: 9783030151959
Publisher: Springer International Publishing

Fig. 5.6The ballistic pendulum consists of a large wooden block suspended by a light wire

Solution 5.8

(a) Using the impulse approximation, the law of conservation of momentum gives the velocities just before and after the collision when the string is still nearly vertical. For a perfectly inelastic collision, the total momentum is conserved but the total kinetic energy is not conserved during the collision. Thus, we have

After the collision, the energy of the (bullet earth) system is conserved since the gravitational force is the only force acting in the system.

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