Physics project on the yo-yo. It's for bonus marks. I need to calculate the angular momentum of a yo-yo when it leaves your hand. The hand represents an inclined plane which imparts the spin. I'm keeping it simple and won't involve friction. What I'm trying to get at is the equation for acceleration down an inclined plane. I've drawn a free body diagram but I just can't get anywhere on it. Yo-yo's mass is 0.2kg, and the incline would be about 50 degrees, I guess. mg for the yo-yo is 1.96N, theta is 50 degrees. How do I get the acceleration down the inclined plane? We haven't covered inclined planes and angular momentum yet, it's not even in the curriculum. That's why it's a bonus project.