Statics. Static Equilibrium. There are three conditions for static equilibrium. The object is at rest There is no net force There is no net torque. With no motion, forces must sum to zero. Each component is treated separately. Find the tension in the ropes. T is the tension to the left
Each component is treated separately
Find the tension in the ropes.
T is the tension to the left
S is the tension to the right
W is the weight downward
T sinq = W = mg
T = mg / sinq = 3.9 x 103 N
S = T cosq = 3.4 x 103 NStatic Forces
q = 30º
m = 200 kg
A ladder leans against a wall with friction against the floor.
Coefficient of static friction m
The sum of torques givesStatic Torques
FNF = mg
Select the wall for the pivot.Pivot Point
FNF = mg
The downward force is multiplied by the lever arm of the stick to become a torque.
The torque on the rock matches the torque from the person.The Lever