Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

9. Work & Energy

Intro to Energy & Kinetic Energy

Physics

9. Work & Energy

Intro to Energy & Kinetic Energy

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Multiple Choice

Which of the following best describes energy changes in a closed system?

Energy can only be transformed, not transferred.

Energy is always lost as heat and cannot be conserved.

Energy can be created or destroyed, but not transferred.

Energy can be transferred or transformed, but the total energy remains constant.

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Verified step by step guidance

Understand the concept of a closed system: In physics, a closed system is one where no matter is allowed to enter or leave, but energy can be exchanged within the system.

Recall the law of conservation of energy: This fundamental principle states that energy cannot be created or destroyed in an isolated system. Instead, it can only be transformed from one form to another or transferred between objects within the system.

Analyze the options given: The first option suggests energy can only be transformed, not transferred, which is incorrect as energy can be both transformed and transferred. The second option states energy is always lost as heat and cannot be conserved, which contradicts the conservation principle. The third option claims energy can be created or destroyed, which is also incorrect.

Identify the correct description: The correct statement is that energy can be transferred or transformed, but the total energy remains constant. This aligns with the law of conservation of energy, which applies to closed systems.

Conclude with the correct understanding: In a closed system, while energy can change forms or move between objects, the total amount of energy remains unchanged, adhering to the conservation principle.