Dynamics Dungeon: Ramp Racer
PREDICT
How this connects to AP Physics 1 (Topics 2.5 and 2.7): on a ramp, tilt your axes: perpendicular to the surface the forces balance (N = mg cosθ), and along the surface the net force is mg sinθ − μN. So a = g(sinθ − μ cosθ), and the mass cancels. The crate starts to slide when tanθ = μs.