There are many ideas for helping students visualize volumes of solids by revolution, but students love to play with Play-Doh‼ This resource includes how to use Play-Doh to discover the formulas for Volumes of Solids by Revolution using Disks and Washers as well as how I incorporate the discovery in my lesson and the examples I use. Depending on how much time I have left in the year, I can teach disks and washers in the same 55 minute class or teach them individually on two different days.
My students encounter this concept in the Larson Calculus textbook in Ch. 7 on Applications of Integration thus the numbering 7-2. Hope this is helpful. Enjoy!
Other labs related to Applications of Integration:
Volume by Cross Section Cake Lab
Volume by Disk Hershey Kiss Lab
Foldable related to Applications of Integration:
Calculus Foldable 7-1: Volumes of Solids