# Collisions - Physics 125 Discussion #13 Problem 1:...

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Physics 125 Discussion #13 1 Problem 1: Ballistic pendulum A ballistic pendulum is used to determine the velocity of a projectile. A 10 gram bullet is fired from a rifle at a speed of 700 m/sec into a 1 .50 kg block of a ballistic pendulum suspended by a string 4 meters long. 1. Define your coordinate system. 2. What is the momentum of the system (bullet + block) before the collision? 3. During the collision the momentum of the system is conserved. Why? θ

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Physics 125 Discussion #13 2 4. After the collision, the block and bullet are now behaving as one object. What is this object’s speed right after the collision? 5. Use conservation of energy to determine how high the pendulum swings. 6. Compare the total KE before the collision to the total KE afterwards. Does the collision lose or gain energy? By how much?
Physics 125 Discussion #13 3 Problem 2: Impact collision A block having a mass of 600 grams is sliding towards the edge of a frictionless table at a speed of 4 m/sec. On the floor, at the base of the table is a 200 gram cart, initially at rest. The table is 1 meter above the floor.

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## Collisions - Physics 125 Discussion #13 Problem 1:...

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