Conservation of Momentum Examples in Everyday Life

📚 Quick Study Guide

• ⚖️ The law of conservation of momentum states that the total momentum of an isolated system remains constant.
• 🚀 In simpler terms, momentum (mass in motion) isn't lost; it's only transferred.
• 🔢 Momentum ($p$) is calculated as mass ($m$) times velocity ($v$): $p = mv$.
• 💥 In a collision, the total momentum before equals the total momentum after: $m_1v_{1i} + m_2v_{2i} = m_1v_{1f} + m_2v_{2f}$.
• 💡 This principle applies when no external forces (like friction) are acting on the system.

🤔 Practice Quiz

1. Which of the following is the BEST example of conservation of momentum in everyday life?
   1. A car accelerating from rest.
   2. A ball bouncing on the ground.
   3. A rocket launching into space.
   4. A leaf falling from a tree.
2. Two ice skaters push off each other. If skater A has a mass of 60 kg and moves at 2 m/s, and skater B has a mass of 40 kg, what is skater B's velocity?
   1. -3 m/s
   2. 3 m/s
   3. -2 m/s
   4. 2 m/s
3. A bullet is fired from a gun. Which statement BEST describes the momentum change?
   1. The bullet gains momentum, and the gun loses an equal amount of momentum.
   2. The bullet gains momentum, but the gun's momentum remains unchanged.
   3. The bullet loses momentum, and the gun gains an equal amount of momentum.
   4. Both the bullet and the gun gain momentum.
4. A bowling ball strikes a pin. What happens to the momentum?
   1. The momentum is entirely lost.
   2. The momentum is transferred from the ball to the pin.
   3. The momentum is increased.
   4. The momentum remains with the ball.
5. A truck collides with a small car. Which vehicle experiences the greater change in momentum?
   1. The truck.
   2. The car.
   3. They experience the same change in momentum, but in opposite directions.
   4. It depends on the speed of the truck.
6. What is the momentum of a 10 kg object moving at 5 m/s?
   1. 2 kg m/s
   2. 50 kg m/s
   3. 5 kg m/s
   4. 15 kg m/s
7. Two objects with different masses collide. Which of the following is ALWAYS conserved?
   1. Kinetic energy.
   2. Velocity.
   3. Momentum.
   4. Mass.