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Unformatted text preview: h Δ Pendulum catcher launcher L 76.87 76.87 76.87 y 26.26 x ABSTRACT For this experiment, we aim to validate, as well as to prove the law of conservation of momentum. Through the use of this principle, we will be able to determine the velocity of a steel ball. For this method, the ball is launched towards the pendulum which causes inelastic collision. Energy is conserved right after the collision which causes the pendulum to rise up. On the other hand, another method was used which demonstrate the principles of projectile motion. A bullet is fired horizontally, which follows a path of projectile. The velocity of the bullet will depend on the range of the projectile. Afterwards, a comparison was made for which can give an accurate result. It shows that by using these both methods, it will yield highly accurate, almost identical, results with a percentage difference of 2.3%. INTRODUCTION Physics can help us realize some misconceptions that today’s media can bring us. In some action movies, if a person is hit by a bullet, they will immediately fly back and break some windows behind him. This experiment could help us understand the idea that the momentum in performance in some action movies is not conserved. For this laboratory, the performer will be a pendulum and the bullet would be a steel ball. Considering conservation of momentum begs the question, if the bullet has the ability to throw a person through a window, what would the recoil of the gun have done to the shooter? If the gun doesn't throw the shooter off his feet, the bullet can't throw the target off his feet. The application of conservation of momentum is widely used throughout the world especially in the collisions of cars. For a policeman will try to question himself who has the greater mass, which has the greater velocity or in what direction does two cars go to know who hit first. For this experiment, we will be using a ballistic pendulum. A ballistic pendulum is an instrument which is capable of capturing the ball hitting it. Using energy conservation law, velocity of the bullet can be obtained. At first the bullet is moving towards the pendulum at velocity, v1 . A pendulum starting at rest, but because of collision, can gain energy. By applying law of conservation of momentum: + = + m1v1 m2v2 m1u1 m2u2 Since the momentum is conserved but not the energy, collision occurred is referred to as inelastic collision. For inelastic collision, final velocity, u of two objects are the same: + = ( + ) m1v1 0 u m1 m2 Thus, the velocity of the bullet is: = ( + ) . v1 u m1 m2 m1 eqn 1 After the momentum-viewing, we cannot determine the final velocity. Thus, we could do the energy conservation-viewing since at post collision, energy is conserved. At the point where the bullet is captured by the pendulum it moves to the right upward. When it achieves the maximum height, it will stop and goes down again. We can apply law of conservation of energy for the point where bullet is inside the pendulum right after...
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