Ty is an eighth grade music teacher must support and encourage students but he must also give them poor grades for not learning their music this causes ty to experience

This causes Ty to experience "Role Strain'.

Role strain refers to a situation where someone in a social or professional role has to face contradicting,  incompatible behavior, expectations, or obligations within a single role, like in the given case Ty on one hand has to encourage and support the students which is a sympathetic trait but at the same time has to be strict in grades.