Why Force Due to Friction Not in Equation of Motion?

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Why is ft (the force due to the friction between the cylinder and the ramp) not included in the equation of motion?
 
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eurekameh said:
Why is ft (the force due to the friction between the cylinder and the ramp) not included in the equation of motion?
Because the cylinder "rolls without slipping".
 
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For this situation, is my Fx equation of motion not true then?