The conditions that the sum of forces and the sum of the torques both vanish:
A)hold for every solid body in equilibrium
B)hold only for elastic solid bodies in equilibrium
C)hold for every solid body
D)are always sufficient to calculate the forces on a solid object in equilibrium
E)are sufficient to calculate the forces on a solid object in equilibrium only if the object is elastic

Question

Quizplus · Accepted Answer

The conditions that the sum of forces and the sum of the torques both vanish, also known as static equilibrium, hold for every solid body in equilibrium, regardless of whether it is elastic or not. These conditions are necessary for a solid object to be in a state of rest or constant velocity. However, they do not alone provide sufficient information to calculate the forces on a solid object. Additional information, such as the object's mass and acceleration, is needed to calculate the individual forces.

The Conditions That the Sum of Forces and the Sum