Lets say you have a box at the bottom of a frictionless ramp and you give it a velocity (X) of lets say 10 m/s, so that when it gets on the ramp, the components velocities would be: Vx = 10 * cos (angle) Vy = 10 * sin (angle) then once it gets ontp the ramp, the gravitational acceleration changes from being -9.81 m/s^2 down (Y) to a combination of X and Y acceleration. I am trying to find the X and Y acceleration, I have been looking at the diagram of the ramp and box and have drawn my force lines to indicate which direction everthing has a force exserted on it, but when I goto calculate the acceleration I get very confused. So lets just say in this example the ramp is at an angle of 50 degrees, the box has in initial X velocity (before the ramp) of 10 m/s and we will esimate gravitational acceleration at -10 m/s^2. so we now have the box on the ramp with: Vx = 10 * cos (60) = 5 m/s Vy = 10 * sin (60) = 8.7 m/s acceleration X = ? -10 * sin (60) = -8.7 m/s^2 ? acceleration Y = ? -10 * cos (60) = -5 m/s^2 ? is that right? or is it: acceleration Y = ? -10 * sin (60) = -8.7 m/s^2 ? acceleration X = ? -10 * cos (60) = -5 m/s^2 ?