Midterm 2, 2017-11-08 Physics 11A, Fall 2017 Question In the ballistic pendulum

Question

Midterm 2, 2017-11-08 Physics 11A, Fall 2017 Question In the ballistic pendulum lab, we determined the velocity, v, of a projectile by analyzing the height. h to which a struck pendulum would swing. The projectile had a known mass, m, and the pendulum had a known mass, M. After collision at max height Before the collision Right after collision M+m 1m. Swing Impact a) Which types of mechanical energy are present in the system at the following times? Let h Om be at the lower dashed line (the center-of-mass height before the collision) Enter your answers on your scantron (problem numbers 17-19) C. Spring Energy A. Kinetic Energy B. Gravitational Potential Energy 17. Before the collision (1) 18. Right after collision (2) 19. After the collision at max height b) What is conserved in the system at the following times? Enter your answers on your scantron (problem numbers 20-22). A. Mechanical Energy B. Momentum 20. During the impact 21. During the swing 22. As you remove the ball from the pendulum C. Both D. Nothing

Explanation / Answer

17 . before the collision : kinetic energy

18. right after collision : kinetic energy

19 :at max height : gravitational potential energy

20 . during the impact the momentum is conserved in horizontal direction .

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