Physical World Test - 4

In ohysics, we can neglect some small forces, quantities and calculation.

Unification is the act of unifying the different laws valid for different phenomena in to a single theory that explains all the different phenomena.

An axiom or postulate is a statement/assumption that is taken to be true, to serve as a premise or starting or base point for further reasoning and arguments.

An axiom or postulate is a statement that is taken to be true, to serve as a premise or starting point for further reasoning and arguments.

In science, a hypothesis is an idea or explanation that you then test through study and experimentation.

Universal law of Gravitational explain the force of attraction between two bodies having mass  and placed at a distance but it never explain how this force generated and what is the origin of this.

Earth and any body pull each other towards themselves , the force applied on both of them remaining the same , but the changes in position of an object is determined by its velocity and acceleration .

A postulate is an assumption, that is, a proposition or statement, that is assumed to be true without any proof. Postulates are the fundamental propositions used to prove other statements known as theorems. Once a theorem has been proven it is may be used in the proof of other theorems.

A model is a representation of something that is often too difficult (or impossible) to display directly. While a model's design is justified using experimental information, it is only accurate under limited situations. An example is the commonly used "planetary model" of the atom, in which electrons are pictured as orbiting the nucleus, analogous to the way planets orbit the Sun. We cannot observe electron orbits directly, but the mental image helps explain the observations we can make, such as the emission of light from hot gases. Physicists use models for a variety of purposes.