Conservation of Energy Worksheet
A Grade 12 Science worksheet on the principles and applications of the conservation of energy, including mechanical, thermal, and electrical energy.
Includes
Standards
Topics
Conservation of Energy
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Read each question carefully and provide concise answers. Show all your work for calculation problems. You may use illustrations to aid your explanations where appropriate.
1. Which of the following statements best describes the Law of Conservation of Energy?
Energy can be created or destroyed, but not transferred.
Energy can be transferred or transformed, but not created or destroyed.
Total energy in a closed system always decreases over time.
Energy is always conserved only in the form of mechanical energy.
2. A roller coaster starts from rest at the top of a 50-meter hill. Assuming no friction, what is its speed at the bottom of the hill?
10 m/s
22.1 m/s
31.3 m/s
98 m/s
3. In a closed system, the total amount of energy remains , although it can change forms.
4. The conversion of potential energy to kinetic energy is a clear example of the of mechanical energy.
5. The efficiency of a machine is always 100% due to the law of conservation of energy.
True
False
6. When a ball is thrown upwards, its kinetic energy is completely converted into potential energy at the peak of its trajectory, ignoring air resistance.
True
False
7. Explain the difference between an open, closed, and isolated system in the context of energy conservation.
8. Describe how the conservation of energy applies to a hydroelectric power plant.
Match each energy form with its description or related principle.
9. Kinetic Energy
a. Energy stored due to position or state
10. Potential Energy
b. Energy of motion
11. Thermal Energy
c. The total energy of an isolated system remains constant
12. Law of Conservation of Energy
d. Energy associated with the random motion of atoms and molecules