📚 Topic Summary
Glancing collisions occur when objects collide at an angle, resulting in momentum being conserved in both the x and y directions. To solve these problems, we break down the initial and final velocities into their x and y components. We then apply the principle of conservation of momentum separately for each direction. Remember to consider whether the collision is elastic (kinetic energy is conserved) or inelastic (kinetic energy is not conserved).
🧠 Part A: Vocabulary
Match the term with its correct definition:
| Term |
Definition |
| 1. Momentum |
A. A collision where kinetic energy is conserved. |
| 2. Impulse |
B. A collision where objects bounce off each other at an angle. |
| 3. Elastic Collision |
C. The product of an object's mass and velocity. |
| 4. Inelastic Collision |
D. A collision where kinetic energy is not conserved. |
| 5. Glancing Collision |
E. The change in momentum of an object. |
🧮 Part B: Fill in the Blanks
In a glancing collision, the total ________ before the collision equals the total ________ after the collision in both the x and y directions. To analyze these collisions, we often use ________ components to determine the velocities in each direction. For an ________ collision, kinetic energy is also conserved.
🧪 Part C: Critical Thinking
Imagine two identical billiard balls colliding on a pool table. One ball is initially at rest. After the collision, both balls move at an angle relative to the original direction of the moving ball. Explain why the angle between their paths after the collision must be 90 degrees if the collision is perfectly elastic.