If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Unit: System of particles and rotational motion

Learn what angular displacement, angular velocity, and angular acceleration mean, as well as how they relate to their linear counterparts.
Learn the relationships between angular displacement, angular velocity, and angular acceleration using the rotational kinematic formulas.
Anyone who has ever opened a door has an intuitive understanding of torque. In this lesson, we'll explore why and how objects rotate using the concepts of torque and rotational equilibrium.
Does a baseball have more kinetic energy if it is spinning? In this lesson, we'll learn how to determine the rotational kinetic energy of an object so we can figure out how much more energy the baseball has.
In this lesson, we'll learn about angular momentum and angular impulse, and how these quantities are related to translational (or linear) momentum.
Angular momentum is constant where there is no net torque, just like how linear momentum is constant when there is no net force. In this lesson, we'll learn about the conservation of angular momentum and how to apply the new conservation law to solve problems.

About this unit

Everything you've learned about motion, forces, energy, and momentum can be reused to analyze rotating objects. There are some differences, though. Here, you'll learn about rotational motion, moments, torque, and angular momentum.