University:
Arizona State University
Course:
PHYS 102 | Introductory Physics I
Academic year:

2024
Views:

198

Pages:

4
Author:

Mohammed N.

Balanced Forces and Equilibrium Forces that are equal in size but opposite in direction are called balanced forces. Vector Fris= 0 We speak of static equilibrium when several forces canceled each other out and then the object remains in a state of rest. We speak of dynamic equilibrium when all the forces on an object balance but it still moves at a constant velocity. . Condition of equilibrium for an objects: The sum of all the forces applied is equal to zero. Balance for an objects on an inclined To ensure that the object remains in equilibrium on an inclined plane, it is necessary to divide the force P into two different components: one parallel to the plane one perpendicular to the plane. To balance the object, it is necessary to apply a force equal in magnitude to the perpendicular component but opposite in direction. Equilibrium for a rigid object: A rigid object is in equilibrium if the sum of the forces applied is zero and if the resultant force is zero Stable Equilibrium: An objects, after having been subjected to a perturbation, is in stable equilibrium if it tends to return to the starting position. Unstable Equilibrium: An objects, after having been subjected to a perturbation, is in unstable equilibrium if moving from its equilibrium position it tends to reach a new equilibrium position. Neutral Equilibrium An object, moved from its equilibrium position, remains in its new equilibrium position Moment of a Force The moment of a force is a vector that expresses the rotational equivalent of linear force. The unit of measurement of the torque is N*m (Newton per meter). With vector M we indicate the moment of force, with r the position vector that identifies the point of application of force, called lever arm, and with F the force. The module of the moment of a force can be calculated as follows: Alpha (a) is the angle between vectors F and r. If more than one force is applied to a rigid object, the resultant moment, compared to the same point on which the force is applied, is given by the sum of the moments of the individual forces.