Practice Energy Conservation: The Fundamental Law - 4.5 | Work, Energy & Simple Machines | IB IMYP Grade 8 Physics
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4.5 - Energy Conservation: The Fundamental Law

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the Law of Conservation of Energy state?

💡 Hint: Think about changes in energy during physical processes.

Question 2

Easy

Give an example of how potential energy is converted into kinetic energy.

💡 Hint: Consider what happens to an object as it moves downward.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

Which of the following best describes the Law of Conservation of Energy?

  • Energy can be created
  • Energy cannot be created or destroyed
  • Energy always disappears

💡 Hint: Recall what the law truly states about energy.

Question 2

True or False: Energy can be lost from a system.

  • True
  • False

💡 Hint: Think about how energy behaves in a closed system.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

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.

Question 2

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.

Challenge and get performance evaluation