The second movement of a symphony is usually written in what form

The speed is usually adagio or andante. Slower than the other movements. This is also true of concertos.

As for the "form", many types are used. See
http://library.thinkquest.org/22673/forms.html

The second movement of a symphony is usually written in a slower and more lyrical form, such as the ternary (ABA) or theme and variations form. To verify this information, you can follow these steps:

1. Consult music theory textbooks or resources: Look for reputable music theory textbooks or online resources that discuss the structure and forms commonly used in symphonies. These sources should provide a reliable explanation of the typical form of the second movement.

2. Study symphonic repertoire: Analyze the scores and recordings of various symphonies from different composers and periods. Pay attention to the structure and character of their second movements to identify recurring patterns or common forms.

3. Examine symphony compositions: Explore the works of well-known composers who have written symphonies, such as Beethoven, Mozart, Haydn, Brahms, and Tchaikovsky. Carefully listen to and study the scores of their symphonies to understand how they approached the second movement and its form.

4. Research scholarly articles: Search for scholarly articles or essays written by experts in music theory or musicology. These sources often delve into detailed analyses of symphonic forms and may provide insights into the structure of second movements.

Remember, while there is a general tendency for the second movement of a symphony to follow a slower and more lyrical form, this is not an absolute rule and composers have experimented with various forms and styles throughout history.