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Ch 7: Rotational Motion in Physics

About This Chapter

View video lessons and learn about the characteristics of rotational motion in physics. The self-assessment quizzes following each lesson can help you measure your understanding of these learning materials.

Rotational Motion in Physics - Chapter Summary and Learning Objectives

In this series of video lessons, an experienced instructor will introduce you to the concept of rotational motion as it relates to physics. You'll learn the difference between objects in rotational motion and translational motion, and you'll also find out how to calculate this motion, both theoretically and practically. Related concepts covered in this chapter include the Big 5 equations in physics as well as topics in torque, kinetic energy, rolling motion and momentum. In these lessons, you'll learn things like:

  • Types of motion
  • How to observe, describe and measure changes in rotational motion
  • Kinds of momentum
  • How to solve equations and word problems

Video Objectives
Differences Between Translational and Rotational Motion Understand what distinguishes translational from rotational motion.
Rotational Kinematics: Definition and Equations Develop kinematic equations to measure rotational motion.
Five Kinematics Qualities and the Big 5 Equations Explain how the five kinematic qualities relate to the Big 5 equations
Rotational Dynamics and Torque Discuss the relationship between rotational dynamics and torque.
Rotational Inertia and Change of Speed Describe how the rotational speed of an object is affected by its rotational inertia.
Kinetic Energy of Rotation Compare and contrast the kinetic energy and change in potential energy of a rotating disk and a falling mass.
Rolling Motion and the Moment of Inertia Compare the observed vs. the theoretical moment of inertia for round objects in motion on an incline; use the conservation of energy principles and your knowledge of rotational motion.
Work & Power in Rotational Motion Calculate an object's kinetic energy, power, and work using formulas.
Angular Momentum vs. Linear Momentum Describe the difference between angular and linear momentum.
Conservation of Angular Momentum Use the law of conservation of angular momentum.
Equilibrium: Translational and Rotational State the characteristics of an object in equilibrium; determine the forces acting on the object that put it into translational and rotational equilibrium.

11 Lessons in Chapter 7: Rotational Motion in Physics
Differences Between Translational & Rotational Motion

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.

Rotational Kinematics: Definition & Equations

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.

Five Kinematics Quantities & the Big 5 Equations

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.

Rotational Dynamics & Torque

4. Rotational Dynamics & Torque

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.

Rotational Inertia & Change of Speed

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.

Kinetic Energy of Rotation

6. 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.

Rolling Motion & the Moment of Inertia

7. 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.

Work & Power in Rotational Motion

8. 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.

Angular Momentum vs. Linear Momentum

9. 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.

Conservation of Angular Momentum

10. 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.

Equilibrium: Translational & Rotational

11. Equilibrium: Translational & Rotational

Learn about the requirements for an object to be under translational or rotational equilibrium. Then work through a couple example problems that show how we can use translational and rotational equilibrium to find the forces acting on an object.

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