Hi guys, first time in this forum. seems legit. I'm in year 12, i have to find or make a EPI (prac) to do with one of these topics. 1. Co-efficient of friction between different surfaces. 2. Strength of nylon/cotton/steel/tin string. 3. Projectile motion. 4. Bending of a beam. 5. The coefficient of restitution of a squash ball. 6. The collision of billiard balls. 7. Centripetal force, acceleration due to gravity/or along inclined. Im going more towards No. 6, the collision of billiard balls but i cant find anything online. if anyone could help me find/make a prac it will be very helpful. (it can be really simple) ill be doing my best to find one for now, thanks. Steve.