torque and statics notes

static means

stationary or at rest

a ____ ______ object whose forces on it are _______ is said to be static

non-moving; balanced

1st condition of equilibrium

the sum of all forces on an object must be zero

forces can be in

lbs, N, dynes

tension and ____ are the

force; same thing

pulleys ______ force

redirect

torque is a measure of

how much a force acting on an object causes it to rotate

pivot point

the axis of rotation

torque is defined as

the cross product of distance from a vector (R) and force (F)

T = rF = rFsin0

if the force is perpendicular to the body

the moment arm is the same as the distance from the pivot point

if the force line of action is at an angle to the body

the moment arm is the imaginary line from the pivot point and perpendicular to the force line

second condition of equilbrium

sum of torques is 0

center of gravity is a

geometric property, average location of the WEIGHT of an object