How many types of forces are there?Explain them?

Dear Student! Jayesh

If you count number of forces, there are many forces existing in nature. All the observed forces and interactions in the universe can be broadly divided into four categories-

  1. Gravitational interactions
  2. Electromagnetic interactions
  3. Weak interactions
  4. Nuclear interactions

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Best wishes!!

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In physics, a force is any influence that causes a free body to undergo an acceleration. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform 

A force is a push or pull acting upon an object as a result of its interaction with another object. There are a variety of types of forces.A force is a push or pull acting upon an object as a result of its interaction with another object. There are a variety of types of forces.

types of force

APPLIED FORCE An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person

GRAVITY FORCE The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself. By definition, this is the weight of the object. All objects upon earth experience a force of gravity that is directed "downward" towards the center of the earth

NORMAL FORCE The normal force is the support force exerted upon an object that is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. On occasions, a normal force is exerted horizontally between two objects that are in contact with each other. For instance, if a person leans against a wall, the wall pushes horizontally on the person

FRICTION FORCE The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types of friction force - sliding and static friction. Thought it is not always the case, the friction force often opposes the motion of an object. For example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion. Friction results from the two surfaces being pressed together closely, causing intermolecular attractive forces between molecules of different surfaces. As such, friction depends upon the nature of the two surfaces and upon the degree to which they are pressed together.

AIR RESISTANCE FORCE The air resistance is a special type of frictional force that acts upon objects as they travel through the air. The force of air resistance is often observed to oppose the motion of an object. This force will frequently be neglected due to its negligible magnitude (and due to the fact that it is mathematically difficult to predict its value). It is most noticeable for objects that travel at high speeds (e.g., a skydiver or a downhill skier) or for objects with large surface areas

TENSION FORCE

The tension force is the force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. The tension force is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire.

SPRING FORCE The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it.

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A Static Load : A good example of this is a person seen on the left. He is holding a stack of books on his back but he is not moving. The force downwards is STATIC.
 

 

A Dynamic Load : A good example of a dynamic load is the person on the right. He is carrying a weight of books but walking. The force is moving or DYNAMIC.

STATIC LOAD (standing still)

   

DYNAMIC LOAD (moving)

     

 

 Internal Resistance : The person in the diagram is sat on the mono-bicycle and the air filled tyre is under great pressure. The air pressure inside it pushes back against his/her weight.

  

Tension : The rope is in “tension” as the two people pull on it. This stretching puts the rope in tension.

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