2d Collisions | Gizmo Answer Key Activity C

| Question | Correct Answer / Explanation | |----------|-------------------------------| | In a 2D elastic collision with equal masses (one stationary), the angle between the outgoing paths is always... | | | Which quantity is conserved in both the x and y directions? | Momentum | | If the total initial x-momentum is 12 kg·m/s and total final x-momentum is 10 kg·m/s, what can you conclude? | The Gizmo data has a rounding error, or an external force was applied. (Ideal: they must be equal.) | | How does reducing elasticity affect the final velocities? | They decrease; the pucks move more slowly after collision due to kinetic energy loss. | | Two pucks of unequal mass collide elastically in 2D. Is kinetic energy conserved? | Yes , only momentum is conserved in both axes, but kinetic energy is also conserved overall in an elastic collision. |

In a 2D collision, momentum is conserved: A) Only in the x-direction B) Only in the y-direction C) Independently in both x and y directions Answer: C 2d Collisions Gizmo Answer Key Activity C

Total mass $M = m_A + m_B = 1.5 + 2.5 = 4.0 \text kg$. Let $V_x$ and $V_y$ be the final velocity components of the combined mass. | Question | Correct Answer / Explanation |

Before diving into the questions, ensure your 2D Collisions Gizmo is configured correctly: | The Gizmo data has a rounding error,

Do not just memorize the numbers in this answer key. Re-run the simulations with random angles, pause mid-collision, and predict the outcome. Physics is not a spectator sport; the Gizmo is your lab. Use this guide to check your work, but let your intuition come from doing.