Unbalanced forces that have a net force in a certain direction are what lead to changes in motion. When multiple forces act on a body, the resultant force, calculated as the vectorial sum of the individual forces, determines whether the body moves or not.Continue Reading
When this resultant force is equal to zero, the individual forces that contribute to this resultant force are balanced, and no motion results. If the resultant force equals any quantity other than zero, the forces that contribute to the resultant are unbalanced, and the body moves. Bodies being acted upon by balanced forces are said to be in equilibrium.
To measure the total forces acting on a body and determine resulting movements, free-body diagrams are constructed depicting the magnitude and direction of each force. Reaction forces resulting from the contact of the body with another body must be taken into account. A simple free-body diagram of an upright person shows the person's weight as a downward force and the upward reaction from the floor as an equal and opposite force. The person is in equilibrium because these two forces balance out. The reaction force from quicksand does not balance out with the weight of a person sinking in it, causing net downward motion.Learn more about Motion & Mechanics
Balanced forces are forces that produce no change in motion, while unbalanced forces produce some type of acceleration. With balanced forces, any forces in a given direction are exactly matched by forces in the opposite direction. With unbalanced forces, the forces in one direction are greater than those in the opposite direction, resulting in a net force that produces acceleration.Full Answer >
Unbalanced force occurs when two forces acting on an object are not equal in size, causing a change in motion. Unbalanced forces cause a still object to move or moving objects to slow down or speed up, stop or change direction.Full Answer >
Forces that are equal in size but opposite in direction are called balanced forces. Balanced forces will not change the motion or move an object at rest. On the other hand, forces that are not equal or opposite and do cause a change in the motion of an object are known as unbalanced forces.Full Answer >
A pulley is a simple tool that can be used for many things, such as lifting heavy objects or to change the direction of applied forces for various means. A pulley is a very simple tool that consists of a wheel on a fixed axle that has grooves for keeping a rope or wire in place. This makes pulleys useful for lifting heavy objects using applied human force.Full Answer >