In classical physics, superposition is the principle of adding two or more physical quantities together to create a new, different quantity. A common example is the superposition of waves, such as two waves on a string interfering with each other. This can result in constructive interference, where the waves add up to create a larger wave, or destructive interference, where the waves cancel each other out. Another example is the calculation of the total force acting on an object, where individual forces from different sources are summed vectorially to determine the resultant force.