Stays putstatic friction 9.80 Nnet force 0.00 N
θ = 30°mg sin(θ)mg cos(θ)mgNf20 Nforce scale

μk can never exceed μs: lowering the static slider drags the kinetic one down with it.

QuantityValue
Weight mg19.60 N
mg sin(θ), along the slope9.80 N
mg cos(θ), into the slope16.97 N
Normal force N16.97 N
Static maximum μsN10.18 N
Friction force f (static, up the slope)9.80 N
Acceleration a0.00 m/s²

The block slides only when mg sin(θ) beats the static maximum μsmg cos(θ). At the defaults, 9.80 N pulls down the slope and friction can hold up to 10.18 N, so it stays put. Tip the ramp one more degree and watch the verdict flip.

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