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Force

 


From many centuries the problem of motion and its causes had puzzled scientists and philosophers until Galileo and Newton developed entirely different approach to understand motion. We have observed that, whenever an object is in motion it involves a form of hit, push or pull. In physics, a force is defined as any interaction such as hit, push, or pull, when unopposed, will change the state of an object. Hence, a force can put a moving object into state of rest or vice versa and a force can also change the shape, size, speed, velocity, or direction of motion. In our upcoming episodes we will discuss, to change the state of an object, either it is in state of motion or state of rest, we need a net external force.

Now let us understand the concept of net force. Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's state. It gives the particle the same acceleration as all those actual forces together. Simply, if more than two forces are being applied on an object at rest, the object will move only in one direction which is the direction of sum of all the forces. This resultant force is known as net force. Based on this concept, force is further subdivided into two categories: Balanced force and Unbalanced force.

Suppose that an object is being pulled from two opposite ends in opposite direction with equal forces, the net force on the object will be zero. Thus, object will not change its state of motion or state of rest. This force is known as balanced force.

Similarly, if an object is being pulled from two opposite ends in opposite direction with unequal forces, the net force on the object will not be zero. Thus, object will move in the direction of resultant force. This force is known as unbalanced force.

Broadly, forces are differentiated in two categories.

 

Fundamental Forces such as

  • Gravitational Force
  • Electromagnetic Force
  • Strong Nuclear Force and
  • Weak Nuclear Force

 

Non-Fundamental Forces such as;

  • Normal Force
  • Friction
  • Tension and
  • Elastic Force etc.

 



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