<p>AP Physics has some multiple choice questions (to test breadth) and some open response questions (depth). Each section is 90 minutes long.
AP Physics is calculus-based and covers the material a lot more in-depth than SAT physics.</p>
<p>You can find the topic outlines here:
AP: <a href="http://www.collegeboard.com/prod_downloads/ap/students/physics/ap-cd-physics-0607.pdf%5B/url%5D">http://www.collegeboard.com/prod_downloads/ap/students/physics/ap-cd-physics-0607.pdf</a>
SAT: <a href="http://www.collegeboard.com/student/testing/sat/lc_two/phys/format.html?phys%5B/url%5D">http://www.collegeboard.com/student/testing/sat/lc_two/phys/format.html?phys</a></p>
<p>Anyways, no single university (not even Harvard) expects international applicants to take AP exams. You should rather focus on the SAT IIs.</p>