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Khan Academy
Khan Academy: More on Normal Force (Shoe on Floor)
This video explains how to determine the normal force for a variety of scenarios (extra forces, diagonal forces, acceleration) involving a shoe on the floor. [10:44]
Khan Academy
Khan Academy: More on Normal Force (Shoe on Wall)
This video shows how to determine the normal force for a shoe shoved against a wall with a diagonal force. [6:46]
Khan Academy
Khan Academy: Mild and Medium Tension
Kahn Academy explains how to solve tension problems for hanging objects. [17:29]