# What is force? definition and types of force with example

From ancient times many philosophers have used the concept of force in the study of stationary and moving objects and simple machines, but thinkers like Aristotle and Archimedes retained the fundamental errors in understanding what is force . According to Aristotle, a force is anything that causes an object to undergo “unnatural motion” .  After that most misconceptions about motion and force were finally corrected by Galileo Galilei and Sir Isaac Newton . Here in this article, we are going to discuss some basic things about the force - that what force is, types of forces, and more about it. Below is a table of contents of what you will know from this article.

• What is force?
• How force is measured?

• What is balanced and unbalanced force? • What is the net force? • What is the push and pull action of force? • What are the types of forces? • What is frictional force? • What is centripetal and centrifugal force? • What are the fundamental forces of nature?

What is force?
In physics, a force is something physical cause that can changes either the size or shape of an object or changes the state of rest or the state of motion of the object. For example - if we press a soft rubber ball from two sides, its shape changes, or on stretching a rubber string, its length increases. And if we push a book lying on a table the book gets displaced.
A force is a vector quantity , so it has a magnitude and a direction. The direction in which the force is applied is known as the direction of the force and the application of force is the point where force is applied.
The force is measured by using the instrument called spring balance . The SI unit to measure force is Newton(N) and the CGS unit to measure force is dyne .

How force is measured?

We get the idea of the force from Newton's first law of motion but it is measured from Newton's second law of motion . According to the second law of motion when we exert a force on an object the rate of change in its momentum is directly proportional to the applied force on it. From this we get

Where,  P = momentum of the object, m = mass of the objects, v = velocity of the object, a = acceleration of the object

Using this formula we can measure the force applied to the object.

What is balanced and unbalanced force?

We know that force is a vector quantity, which means it has both magnitude and direction. Based on this magnitude of the force and the direction of the force the balanced force and unbalanced force can be defined.

Balanced force:

Balance forces are two forces acting on an object with the same magnitudes and opposite directions.  When two people exert the same force on an object from opposite directions then the object is in the equilibrium state. This is an example of balanced force.

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