3.2 Equilibrium of forces and 3.3 Static Equilibrium

________: object is displaced, it experiences a net force or torque in same direction as displacing force.

Unstable equilibrium

________: if the object is displaced, it experiences a net force or torque in the opposite direction to the displacing force= restoring force /torque.

Stable equilibrium

________: if the object is displaced, its equilibrium is unaffected.

Neutral equilibrium

translational equilibrium → sum of upwards forces = sum of downwards forces

sum of the forces acting on it is 0 N

rotational equilibrium → sum of clockwise moments = sum of anticlockwise moments

sum of the moments (torques) acting on it is 0 N m

if the object is displaced, it experiences a net force or torque in the opposite direction to the displacing force = restoring force/torque

stable equilibrium

object is displaced, it experiences a net force or torque in same direction as displacing force

unstable equilibrium

if the object is displaced, its equilibrium is unaffected

neutral equilibrium