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Pulley system on a double inclined plane

239 bytes removed, 12:16, 7 September 2011
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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