Force is a push or pull acting on an object which change or tends to change the state of the object.Force meters container a spring connecting to a metal hook. The the spring stretches when a force is applied to the hook. The bigger the force applied, the longer the spring stretches and the greater is the reading. The unit of force is called the Newton, and it has this symbol N.So 100 N is a bigger force than 5N. Pressure Force and Area. The concept of Force and pressure are based on push or pull. Take two wooden blocks A and B. Both are 1 metre×2 metre×1 metre in size and weight the same.Put the block A in vertical position and block B in horizontal position on a soft ground. They exert the same force but the force from block B is spread over a larger area. So the force on each square centimetre is a reduced. Similarly your weight acting downwards causes you to exert a force on the ground through the soles of your shoes. If you lie down on the ground this force acts over all the area of your body in contact with the ground. These areas together and larger than the areas of the soles of your shoes, and you therefore push the ground with less pressure when lying down then when you are standing up. Pressure is the effect of a force applied to the surface.Pressure is the amount of force acting per unit area. The cyber law of pressure is p. Mathematically Pressure=force÷area on which it acts Where P is the pressure f is the normal force and a is the area of the surface in contact. Example. 1. Air pressure in car tires support the weight of car.
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