Statics Exam 1

Newtons 1st Law

an object in motion or at rest remains in this state unless acted upon by an external force (statics)

Newtons 2nd Law

a particle acted on by unbalanced forces experiences an acceleration (dynamics)

Newtons 3rd Law

for every action there is an equal and opposite reaction (strength/materials)

4 characteristics of a force (vector)

magnitude, direction, sense (arrow direction), point of application

varigons theorem

moment of a force around a point is equal to the algebraic sum of the moment of its components

couple definition 

2 coplanar parallel forces equal in magnitude and opposite in sense 

4 characteristics of a couple moment

parallel forces
equal in magnitude
opposite in direction
magnitude of resultant = 0

3 characteristics of a couple force

balanced by equal and opposite couple in same plane

defined by magnitude and sense of rotation

can be transffered to any location in its plane and have same effect

3 cables/cords/pulleys assumptions 

negligible weight

cannot stretch

only resists tension