# Tagged With "Radius"

Topic

#### Using a 33-45-78 Turntable to Show that Centripetal Acceleration is Proportional to the Square of the Velocity and Inversely Proportional to Radius

PocketLab in conjunction with a 33-45-78 RPM turntable is an ideal setup for studying centripetal acceleration. There are two videos that can be found in the Videos page of this web site. They show that (1) keeping radius constant implies that centripetal acceleration is proportional to the square of the velocity, (2) keeping velocity constant while varying the radius implies that centripetal acceleration is inversely proportional to the radius. The PocketLab is placed in its silicone...

Comment

#### Re: Determining the Radius of Curvature of a Gradual Street Turn

Rich- this is such a great demo! I'm sorry the video sync output failed after the trials. We've got an app update coming soon that will fix the bug and update a few other features.

Blog Post

#### Determining the Radius of Curvature of a Gradual Street Turn

This lesson is a physics application of PocketLab that allows students to determine the radius of curvature of a gradual turn on a street. A PocketLab mounted on the dashboard of a car records both the angular velocity and the centripetal acceleration of the car as it moves at a nearly constant speed around the curve. All of the required data for an example problem are contained in files attached to this lesson. Alternately, students can collect their own data. If the latter approach is...