4.5 - Energy Conservation: The Fundamental Law
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Practice Questions
Test your understanding with targeted questions
What does the Law of Conservation of Energy state?
💡 Hint: Think about changes in energy during physical processes.
Give an example of how potential energy is converted into kinetic energy.
💡 Hint: Consider what happens to an object as it moves downward.
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Interactive Quizzes
Quick quizzes to reinforce your learning
Which of the following best describes the Law of Conservation of Energy?
💡 Hint: Recall what the law truly states about energy.
True or False: Energy can be lost from a system.
💡 Hint: Think about how energy behaves in a closed system.
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Challenge Problems
Push your limits with advanced challenges
A 5 kg cat climbs to a height of 3 meters. Calculate its potential energy and determine the kinetic energy just before it jumps down, assuming negligible air resistance.
💡 Hint: Use the potential energy formula for the first part and remember KE and PE relationship.
If a machine has an input energy of 500 Joules and it performs only 350 Joules of useful work, what is its efficiency and what happens to the excess energy?
💡 Hint: Consider how to calculate efficiency and what it reveals about energy usage.
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