A force is a push or pull that can cause an object to move, change its speed, or change its direction. It is a vector quantity, which means it has both magnitude (size) and direction.
There are four fundamental forces in nature: gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force. In everyday life, we also encounter frictional force, tension force, normal force, and applied force.
According to Newton's First Law of Motion, an object at rest will stay at rest and an object in motion will stay in motion with a constant velocity unless acted upon by an unbalanced force. This means that forces can cause objects to accelerate, decelerate, or change direction.
Force is calculated using the formula F = m x a, where F is force in Newtons (N), m is mass in kilograms (kg), and a is acceleration in meters per second squared (m/s^2). This formula is derived from Newton's Second Law of Motion.
Force and pressure are related but distinct concepts. Force is a vector quantity that is exerted on an object, while pressure is a scalar quantity that describes the amount of force exerted over a given area. In other words, pressure is a measure of force per unit area.