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→Basic components of force diagram

| <math>f_{s1}</math> || [[static friction]] || no sliding || adjusts so that there is no net acceleration along the incline. At most equal to <math>\mu_{s1}N_1</math>. || The direction could be either up or down the incline, depending on whether the remaining forces create a net tendency to pull <math>m_1</math> down or pull it up.

|-

| <math>f_{k1}</math> || [[kinetic friction]] || sliding || <math>\mu_{k1}N_1</math> where <math>N_1</math> is the normal force || opposite direction of motion -- hence down the incline if sliding up, up the incline if sliding down~~. Assuming the block was ''initially'' at rest, it can only slide down, hence ''up the incline'' is the only possibility~~.

|}

| <math>f_{s2}</math> || [[static friction]] || no sliding || adjusts so that there is no net acceleration along the incline. At most equal to <math>\mu_{s2}N_2</math>. || The direction could be either up or down the incline, depending on whether the remaining forces create a net tendency to pull <math>m_2</math> down or pull it up.

|-

| <math>f_{k2}</math> || [[kinetic friction]] || sliding || <math>\mu_{k2}N_2</math> where <math>N_2</math> is the normal force || opposite direction of motion -- hence down the incline if sliding up, up the incline if sliding down~~. Assuming the block was ''initially'' at rest, it can only slide down, hence ''up the incline'' is the only possibility~~.

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