1. The problem statement, all variables and given/known data In a lab assignment we created a Fletcher's trolley system and were asked to calculate the normal force, the force of friction, and then create a graph of both to find the coefficient of kinetic friction. So far, the variables I have are: Hanging mass: 0.100 kg Sliding mass: 0.1553 kg Distance traveled by the sliding mass: 0.398 m Time taken for the sliding mass to reach the ground: 0.89 s Acceleration of the system: 1.01 m/s^2 Normal force: 1.52 N Force of friction : Unknown 2. Relevant equations The acceleration of the system was found using the equation a=(2(d-vit))/t^2 which i simplified to a=2d/t^2 since vi was 0 m/s. The normal force of the sliding object was found using Fn = mg The force of friction would be calculated using Ffk = Fn*μk but I don't have μk. 3. The attempt at a solution As stated above, I tried using Ffk = Fn*μk but i didn't have all the variables.