Simulation of Newton's Cradle, a device consisting of several steel balls suspended from a cage. Uses the 2D Rigid Body Physics Engine. Each ball acts like an individual pendulum. At rest all the balls are touching.
It was essential to remind people that all the matter around us has one base unit: the atom. Dalton thought it was important to use his system of symbols for the representation of chemical elements because it was helpful to remember exactly which atoms lay at the basic structure of the matter. It was easy for people to use symbols for elements in chemical formulas. He pictured the atoms as small balls and this is the same way that he depicted models of elements and compounds.
According to Dalton's Atomic theory atoms of one element can combine with atoms of another element to form compounds - new complex particles. In a given compound however the different types of atoms are always present in the same relative numbers. Dalton's atomic theory states that all matter is made of small particles called atoms. But he wrongly assumed that atoms cannot be divided. In the late nineteenth century, it was proved that atom can be further divided into three subatomic particles called electron, proton and neutron.