1. The problem statement, all variables and given/known data To calculate the kinetic friction of a block of wood and determine its acceleration by timing it as it travels down a slope. The equipment available consists: of a plank of wood, clamps etc. for raising one end of it to give an inclined plane, blocks to slide down the plane, weights which may be attached to the blocks, measuring equipment, and a timer.Can this be achieved without knowing the mass of the blocks? Because despite being allowed to use weights the equipment doesn't mention digital scales... Known data: height & distance (slope), time, angle(Ө), acceleration. Us (static coe.) 2. Relevant equations Us = TanӨ (Ө being angle of slope) Uk = Ff= P+mgsinӨ (P =Applied Force) Nf mgCosӨ 3. The attempt at a solution I have already completed the results to get the Us (static coefficient) = TanӨ . I know that if the weight of the block is doubled so will the frictional force, but I am unsure how the acceleration helps to solve the Uk? Have I missed something? Thanks.