Energy Conservation Physics Questions for Beginners

📚 Quick Study Guide

🔍 Energy conservation is a fundamental principle stating that the total energy of an isolated system remains constant. It can transform into different forms but cannot be created or destroyed. 💡 The Law of Conservation of Energy: $E_{total} = constant$ 📝 Kinetic Energy (KE): Energy of motion, calculated as $KE = \frac{1}{2}mv^2$, where $m$ is mass and $v$ is velocity. 🌡️ Potential Energy (PE): Stored energy due to position or condition. For gravitational potential energy: $PE = mgh$, where $g$ is the acceleration due to gravity and $h$ is height. ⚙️ Work-Energy Theorem: The work done on an object equals the change in its kinetic energy: $W = \Delta KE$ ⚡ Closed System: A system where no energy enters or leaves. 🌍 Important Note: In real-world scenarios, energy might appear to be 'lost' due to friction or air resistance, but it's actually converted into other forms like heat or sound.

🧪 Practice Quiz

1. What is the primary principle of energy conservation?
   1. Energy can be created but not destroyed.
   2. The total energy of an isolated system remains constant.
   3. Energy always decreases over time.
   4. Energy can be destroyed but not created.
2. A ball is dropped from a height of 10 meters. Which type of energy increases as it falls?
   1. Potential energy
   2. Kinetic energy
   3. Total energy
   4. Thermal energy
3. What formula is used to calculate kinetic energy?
   1. $KE = mgh$
   2. $KE = \frac{1}{2}mv^2$
   3. $KE = mc^2$
   4. $KE = Fd$
4. A 2 kg object moves with a velocity of 5 m/s. What is its kinetic energy?
   1. 5 J
   2. 10 J
   3. 25 J
   4. 50 J
5. If the work done on an object is 50 J, what is the change in its kinetic energy?
   1. 25 J
   2. 50 J
   3. 100 J
   4. 0 J
6. Which of the following is NOT a form of energy?
   1. Potential energy
   2. Kinetic energy
   3. Momentum
   4. Thermal energy
7. In a closed system, what happens to the total energy?
   1. It increases
   2. It decreases
   3. It remains constant
   4. It fluctuates randomly