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 scenarios best illustrates kinetic energy in everyday life?

A book resting on a table.

A light bulb turned off.

A compressed spring held in place.

A car moving at a constant speed on a highway.

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Verified step by step guidance

Step 1: Understand the concept of kinetic energy. Kinetic energy is the energy that an object possesses due to its motion. It is given by the formula:

E_{k} = \frac{1}{2} m v^{2}

, where

m

is the mass of the object and

v

is its velocity.

Step 2: Analyze each scenario to determine if kinetic energy is present. A book resting on a table has no motion, thus no kinetic energy. A light bulb turned off is not moving, so it also has no kinetic energy. A compressed spring held in place is not moving, so it does not have kinetic energy either.

Step 3: Consider the scenario of a car moving at a constant speed on a highway. The car is in motion, which means it has kinetic energy. The constant speed indicates that the velocity is not zero, contributing to the kinetic energy.

Step 4: Apply the kinetic energy formula to the car scenario. Since the car has mass and is moving with a certain velocity, it possesses kinetic energy. This aligns with the definition of kinetic energy as energy due to motion.

Step 5: Conclude that the scenario of a car moving at a constant speed on a highway best illustrates kinetic energy in everyday life, as it involves an object in motion, which is the key characteristic of kinetic energy.