A force is measured using a device called a force meter or a spring scale. This device uses the principle of Hooke's law, which states that the force applied to an object is directly proportional to its displacement. The force meter measures the displacement of the spring and converts it into a force measurement.
There are four fundamental forces in nature: gravity, electromagnetism, strong nuclear force, and weak nuclear force. In everyday life, we encounter forces such as friction, tension, compression, and normal force. These forces can be categorized as contact forces or non-contact forces.
When multiple forces act on an object, the net force is the vector sum of all the individual forces. This means that we can determine the direction and magnitude of the net force by adding all the forces together. If the net force is non-zero, then we know that multiple forces are acting on the object.
A balanced force is when the net force on an object is equal to zero. This means that the individual forces acting on the object cancel each other out, resulting in no acceleration. An unbalanced force is when the net force is non-zero, resulting in acceleration of the object in the direction of the net force.
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that as the force increases, the acceleration will also increase, but as the mass increases, the acceleration will decrease.