Force vs Pressure

Force V/S Pressure

        "जोर लगाके हईया"  जब हम कोई मेहनत का  काम करते है तो ये शब्द मुँह से जरूर निकलता है वैसे क्या आपको पता है प्रेशर नाम भी इसी से जुड़ा सा लगता है पर वो विज्ञान की नजरो में अलग है आईये जानते है कैसे ?

 Force is a physical quantity that describes the interaction between two objects. It is defined as the push or pull that one object exerts on another object. Force is a vector quantity, meaning that it has both magnitude (size) and direction, means if we say the x amount of force is acting then we also tell that the force is acting in which direction. The SI unit of force is the Newton (N).

There are two types of forces : Contact forces and non-contact forces. Contact forces are forces that require physical contact between two objects. Examples of contact forces include friction, tension, normal force, and air resistance.  non-contact forces, also called action-at-a-distance force, do not require physical contact between two objects. Examples of non-contact forces include gravitational force, electric force, and magnetic force.

 

The magnitude of a force can be calculated using the formula F=ma, where F is the force, m is the mass of the object being acted upon, and a is the acceleration of the object. This is known as newton's second law of motion. if an object experiences a net force, it will accelerate in the direction of the force.

Forces can also be classified as balanced or unbalanced. When the net force on an object is zero, the forces acting on the object are said to be balanced. If the net force on an object is not zero, the forces acting on the object are said to be unbalanced, and the object  will accelerate in the direction of the net force. इस लाइन को हम एक उदहारण से समझते है मान लीजिये आप की गाडी कही फस जाय और आप उसे धक्का मार के निकलने  कोशिश करे पर चूँकि जिस गड्ढे में गाडी फंसी है उसमे से निकलने के लिए जो बल की मात्रा चाहिए आप उतना बल नहीं लगा रहे है तो वो अनबैलेंस बल कहलायेगा और आपकी गाडी नहीं निकलेगी। अब अगर आप ने उतना जोर लगाया जितना गाडी में गुरुत्वाकर्षण और गाडी के वजन के कारन गाड़ी फांसी है तो दोनों बल बराबर हो जायेंगे और बैलेन्स बल हो जायेगा। गाड़ी को निकलने के लिए आपको जरूरत से ज्यादा बल लगाना पड़ेगा। 

Forces can be represented using free body diagrams, which are diagrams that show all the forces acting on an object. Arrows are used to represent the magnitude and direction of each force, and the length of the arrow represents the magnitude of the force.फ्री बॉडी डायग्राम में हम किसी वस्तु पर कितना और किस दिशा में बल लग रहा है दोनों दर्शाते  है। 

        Now what is Pressure ?

Pressure is also a physical quantity that describes the force exerted per unit area. it is defined as the amount of force acting perpendicular to a unit area. the SI unit of pressure is the Pascal(Pa), which is equal to one Newton per square meter (N/m2).

Pressure is a scalar quantity, meaning that it has only magnitude (size) and no direction. However, the direction of the force that is causing the pressure is perpendicular to the surface on which the pressure is being exerted.

Pressure can be applied to an object in several ways, including atmospheric pressure, fluid pressure, and contact pressure.

Atmospheric pressure is the pressure exerted by the Earth's atmosphere on the objects  surface. It is caused by the weight of the air above the object and varies with altitude and weather conditions.

Fluid pressure is the pressure exerted by a fluid on an object immeresed in it. it is dependent on the density and depth of the fluid, as well as the gravitational force acting on the fluid.

Contact pressure is the pressure exerted by two solid surfaces in contact with each other. it is dependent on the force and area of contact between the two surfaces.

Pressure can also be expressed as gauge pressure or absolute pressure. Gauge pressure is the pressure measured relative to atmospheric pressure, while absolute pressure is the pressure measured relative to a perfect vacuum.

In engineering and science, pressure is an important parameter in many applications, such as hydraulic systems, gas laws, and fluid dynamics. Understanding the concept of pressure is essential in understanding how fluids and gases behave in various systems.

       Pressure and force are both physical concepts that describe the behavior of objects in the world around us, but they refer to different aspects of that behavior.

Force is a measure of the push or pull that one object exerts on another object. it is typically measured in units of Newtons (N) and can be described in terms of its magnitude and direction. For example, a person pushing a box with a force of 10N to the right.

Pressure, on the other hand, is  a measure of the force exerted per unit area. it is typically measured in units of pascals (Pa) and is defined as the force per unit area perpendicular to the surface on which the force is acting. For example, the pressure exerted by a person's foot on the ground when standing is the force of their weight divided by the area of their foot in contact with the ground.

In an overall aspect, force is a measure of the push or pull between two objects, while pressure is a measure of the force per unit area acting on an object's surface.

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