SN instructed the reason it is important to help or use proper turning techniques to prevent friction and shearing of skin. Friction usually, but not always, accompanies shear. Friction is the force of rubbing two surfaces against one another. Shear is the result of gravity pushing down on the patient's body and the resistance between the patient and the chair or bed. When combined with gravity/force (pressure), friction causes shear, and the outcome can be more devastating than pressure alone.