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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Free Body Diagrams:
Free Body Diagrams

Static Equivalence:
Static Equivalence