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 statements best explains the relationship between potential energy and kinetic energy in terms of energy transfer?

Kinetic energy increases as potential energy remains constant.

Kinetic energy is converted into potential energy when an object is at rest.

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

Potential energy is converted into kinetic energy as an object falls.

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Verified step by step guidance

Begin by understanding the concepts of potential energy and kinetic energy. Potential energy is the energy stored in an object due to its position or configuration, often related to height in gravitational systems. Kinetic energy is the energy of motion, dependent on the object's mass and velocity.

Consider the scenario of an object falling under the influence of gravity. As the object falls, its height decreases, which means its gravitational potential energy decreases.

According to the law of conservation of energy, energy cannot be created or destroyed, only transformed from one form to another. As the potential energy decreases, it is converted into kinetic energy, causing the object's speed to increase.

Mathematically, the potential energy (PE) can be expressed as

P_{E} = mgh

, where

m

is mass,

g

is acceleration due to gravity, and

h

is height. Kinetic energy (KE) is given by

= rac{1}{2}mv^2

, where

v

is velocity.

As the object falls, the decrease in potential energy is equal to the increase in kinetic energy, maintaining the total energy of the system constant. This illustrates the conversion of potential energy into kinetic energy during the fall.