Concepts Addressed By CATS
Separating Bodies: Identify forces acting on a subset of a system of bodies.
Newton’s 3rd Law: Forces between two contacting bodies must be equal and opposite.
Static Equivalence: Static equivalence between forces, couples and combinations.
Roller: Direction of force between the roller and the rolled surface.
Slot: Direction of force between pin and slot of a member.
Negligible Friction: Direction of force between frictionless bodies in point contact.
Representation: Representing unknown loads at various connections.
Friction: Sorting out implications of equilibrium and Coulomb’s Law on friction force.
Equilibrium: Consideration of both force and moment balance in equilibrium.
Sample Questions in Three Concept Areas
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