Experiment 10 The Ballistic Pendulum In-Lab Worksheet Date Section # 1) First we

Question

Experiment 10 The Ballistic Pendulum In-Lab Worksheet Date Section # 1) First we place the origin of an x-y coordinate system at the pivot point in Figure 2. As the compressed spring launches the steel ball, it gains an initial velocity and linear momentum. Relative to the origin it has an angular momentum L. The mass of the ball is m, its muzzle velocity is v and r, is the distance from the pivot point to the center of the ball. As the ball exits the gun, and v are nearly perpendicular to each other, so we can write: 2) The ball enters a hole cut in the cup and comes to a stop. There is a small, spring-loaded lever in the cup that prevents the ball from rolling back out as the pendulum swings up. This collision is , therefore kinetic energy- conserved. (elastic / inelastic) (is not / is) 3) In any event, angular momentum is conserved in this collision. Write one sentence explaining what this means. Rewrite this conservation equation using the result from Exercise (1) and Equation (1) from the Concept section. 4) The rotational kinetic energy of the pendulum just after the collision will equal the gravitational potential energy of the pendulum when it reaches its maximum swing. So Rewrite the equation from Exercise (4) but replace the kinetic energy term with PE 5) 9-5

Explanation / Answer

1.Since they are perpendicular, so we can directly write, L = rb mv. as sin(theta=90)=1

2. since the figure is not provided, so I cannot tell the exact answer. but if you see that the system gets freeze after some time, means nothing moves after collision then it's inelastic collision and Kinetic Energy is not conserved.

If after the collision, something else is moving then it's an elastic collision and Kinetic energy will be conserved in this case.

Remember, Elastic means K.E. conserved. Inelastic means K.E is not conserved. That's a simple rule.

3.It means the Kinetic energy of the system is conserved in every event. [without figure, this is the only thing I can say]

4. Since I can't see the equations and figure also, so I can't answer this question. Sorry. :(

5. Since I can't see the equations and figure also, so I can't answer this question also. Sorry. :(

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