A force is a push or pull upon an object resulting from the object's interaction with another object. Forces only exist as a result of an interaction. There are many types of forces like force of gravity, normal force, tension, force of friction, applied force… Firstly, gravitational force, also known as gravity, is the force of attraction that pulls two objects together. In simple words, gravity is the force of nature that drags a body towards the center of the Earth or towards any other physical object. Gravity majorly depends on the mass of the objects and the distance between them. For instance, the objects present on the surface of the earth do not levitate or float in the air, tides are the short term periodic rise and fall of water in oceans, The celestial bodies present in space revolve around the sun and rotate at their respective axis, the revolution of the moons around their respective planets these are because of the presence of the gravitational force present between the objects and the earth. The same force is responsible for Normal force is a contact force. If two surfaces are not in contact, they can't exert a normal force on each other. For example, the surfaces of a table and a box cannot exert normal forces on each other if they are not in contact. However, when two surfaces are in contact (e.g. a box and a table) they exert a normal force on each other, perpendicular to the contacting surfaces. This normal force will be as large as necessary to prevent the surfaces from penetrating each other. Tension is a force that is built as a result of pulling a rope or a wire from both sides. All the objects that are present in contact with each other exert a force on each other. The best example of a tension force can be seen while pulling a rope. When a pull force is applied to the rope, a significant amount of tension gets built. Whereas, while pushing the rope, the tension gets lost, and it goes slack. In other example, the rope becomes a medium to transfer energy between the bucket and the person trying to pull the water out of the well. Therefore, with the appropriate use of tension force and pulley, the process gets simplified, and water can be easily extracted. Friction is a force that tends to oppose the relative motion between two bodies in contact. Frictional force always acts on a moving body from the direction opposite to the direction of motion. It opposes the motion, and therefore, helps to reduce the speed of the moving object. It is a contact force. Based on the type of motion between the two objects, the force of friction can be classified into four broad categories. A force of friction that acts between an object and a surface on which the object is placed is known as static friction. When a force is applied to an object resting on a surface to put it into motion, the main requirement is that the magnitude of applied force must be higher than the force of friction provided by the surface. It is also known as limiting friction. Walking, rock climbing, etc., are some examples of static friction. Sliding friction exists when an object is dragged over the surface of another. It is weaker than static friction. Sliding friction is also known as kinetic or dynamic friction. Dragging a block kept on the table, writing, playing on a slide, etc., are some examples of sliding friction. What I learned from this lesson is that we use forces all the time without realizing it in our lives. The examples I have given above are actually very everyday things. The fact that I learned these forces together with their calculations actually caused me to use them involuntarily even in daily life. If I choose a branch such as engineering in my future plans, such calculations and knowledge will be very useful for my engineering branch.
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