Varignon's Theorem A rigid body is in equilibrium if the total internal forces acting on the body are zero. In other words, the sum of the forces acting in...
Varignon's Theorem
A rigid body is in equilibrium if the total internal forces acting on the body are zero.
In other words, the sum of the forces acting in the x-direction and the y-direction must be zero.
Examples:
A car parked on a hill will be in equilibrium because the forces of gravity and normal force acting on the car will balance each other out.
A block sitting on a spring will be in equilibrium because the force of gravity on the block is balanced by the force of compression in the spring.
A boat floating in water will be in equilibrium because the buoyant force acting on the boat is equal to the weight of the water displaced by the boat