# Ch 7: Rotational Motion

### About This Chapter

## About This Chapter

This Rotational Motion chapter explores the ways in which things move in our physical world. A wheel is an example of an object that uses rotational motion. In this chapter, you'll take a look at kinematic properties, and explore the different types of momentum. You'll also perform calculations with rolling objects. Once you have completed these video lessons, you should be able to:

- Explain and use equations for rotational kinematics
- Define rotational inertia
- Understand the process of rolling motion
- Identify the differences between translational and rotational motion or translational and rotational equilibrium

Video | Objective |
---|---|

Differences Between Translational and Rotational Motion | Describe how translation and rotational motion differ from each other. |

Rotational Kinematics: Definitions and Equations | Learn about the motion of objects and groups of objects. |

Five Kinematics Qualities and the Big 5 Equations | Explain the relationship between kinematic equations and properties. |

Rotational Dynamics and Torque | Explore the tendency of force to rotate an object. |

Rotational Inertia and Change of Speed | Learn about concepts related to the resistance of changes in motion. |

Kinetic Energy of Rotation | Calculate the kinetic energy of a falling mass and rotating disk. |

Rolling Motion and the Moment of Inertia | Use energy principles to explore the applications of rolling objects. |

Work and Power in Rotational Motion | Study work and power as they apply to rotational motion. |

Angular Momentum vs. Linear Momentum | Compare angular and linear momentum. |

Angular Momentum and Conservation | Find the answer to a word problem using the law of conservation of angular momentum. |

Equilibrium: Translational and Rotational | Compare and contrast translational and rotational equilibrium. |

### 1. Differences Between Translational & Rotational Motion

After watching this lesson, you'll be able to explain the difference between translational and rotational motion, explain how translational quantities are replaced by rotational ones in physics and apply Newton's First Law to rotation. A short quiz follows.

### 2. Rotational Kinematics: Definition & Equations

After watching this lesson, you should be able to explain what kinematics is, give a rotational variable that corresponds to each linear kinematic variable, and solve problems using rotational kinematics equations. A short quiz will follow.

### 3. Five Kinematics Quantities & the Big 5 Equations

After watching this lesson, you will be able to list the five kinematics variables in rotational motion and use the five equations of constant acceleration to solve problems involving rotational motion. A short quiz will follow.

### 4. Torque: Concept, Equation & Example

After watching this lesson, you will be able to explain what torque is conceptually and mathematically and use both the equation and Newton's First Law for rotation to solve problems involving torque. A short quiz will follow.

### 5. Rotational Inertia & Change of Speed

After watching this lesson, you will be able to explain what rotational inertia is, describe how it makes it harder to change the speed of rotation, and solve rotational inertia problems. A short quiz will follow.

### 6. The Parallel-Axis Theorem & the Moment of Inertia

After watching this lesson, you will be able to explain what the parallel axis theorem is and how it is used. You will also be able to use the theorem to solve problems. A short quiz will follow.

### 7. Kinetic Energy of Rotation

After watching this lesson, you will be able to explain what kinetic energy of rotation is, provide the equation to calculate it, and solve simple kinetic energy of rotation problems. A short quiz will follow.

### 8. Rolling Motion & the Moment of Inertia

After watching this lesson, you should be able to figure out the moment of inertia of an object as it rolls down a ramp and compare it to a theoretical value. A short quiz will follow.

### 9. Work & Power in Rotational Motion

After watching this lesson, you will be able to explain what work and power are in the context of rotational motion and use equations to solve problems involving rotational work and power. A short quiz will follow.

### 10. Angular Momentum vs. Linear Momentum

After watching this lesson, you will be able to explain the difference between angular and linear momentum and solve problems using angular momentum equations. A short quiz will follow.

### 11. Conservation of Angular Momentum

After watching this video you will be able to explain what is meant by conservation of angular momentum. You will also be able to use this concept along with the equation to solve problems. A short quiz will follow.

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### Other Chapters

Other chapters within the UExcel Physics: Study Guide & Test Prep course

- Introduction to Physics
- Vectors
- Kinematics
- Force and the Laws of Motion
- Work and Energy in Physics
- Linear Momentum in Physics
- Equilibrium and Elasticity
- Waves, Sound, and Light
- Fluids in Physics
- Thermodynamics in Physics
- Electrostatics
- Circuits in Physics
- The Physics of Magnetism
- Wave Optics
- Relativity
- Modern Physics & Nuclear Physics
- UExcel Physics Flashcards