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

How are potential energy and kinetic energy related in a closed system?

Potential energy is always greater than kinetic energy in a closed system.

Kinetic energy can be converted into potential energy, but potential energy cannot be converted into kinetic energy.

Potential energy can be converted into kinetic energy and vice versa, conserving the total mechanical energy.

Potential energy and kinetic energy are always equal in a closed system.

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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 energy is lost to the surroundings. This means that the total energy within the system remains constant over time.

Define potential energy and kinetic energy: Potential energy is the energy stored in an object due to its position or configuration, while kinetic energy is the energy of an object due to its motion.

Apply the principle of conservation of mechanical energy: In a closed system, the total mechanical energy (sum of potential and kinetic energy) is conserved. This means that energy can be transformed from one form to another, but the total amount remains constant.

Explain energy transformation: Potential energy can be converted into kinetic energy and vice versa. For example, when an object falls, its potential energy decreases while its kinetic energy increases, keeping the total energy constant.

Conclude with the correct relationship: In a closed system, potential energy and kinetic energy are interchangeable, and their sum remains constant, which aligns with the principle of conservation of energy.