newton meter

watt

joule

kilogram meter/sec.

one point

two points

plane

perpendicular planes

one point

one plane

different planes

perpendicular planes

introduce internal stresses

balance the other forces acting on it

retard its motion

all of these

if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

if a polygon representing forces acting at a point is closed then forces are in equilibrium

if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium