1.6 SUMMARY

NCERT Physics books for blind and visually impaired students made screen readable by Professor T K bansal.

1.
Physics deals with the study of the basic laws of nature and their manifestation in different phenomena. The basic laws of physics are universal and apply in widely different contexts and conditions.

2.
The scope of physics is wide, covering a tremendous range of magnitude of physical quantities.

3.
Physics and technology are related to each other. Sometimes technology gives rise to new physics; at other times physics generates new technology. Both have direct impact on society.

4.
There are four fundamental forces in nature that govern the diverse phenomena of the macroscopic and the microscopic world. These are
the ‘gravitational force’,
the ‘electromagnetic force’,
the ‘strong nuclear force’, and
the ‘weak nuclear force’.
Unification of different forces/domains in nature is a basic quest in physics.

5.
The physical quantities that remain unchanged in a process are called conserved quantities. Some of the general conservation laws in nature include the laws of conservation of mass, energy, linear momentum, angular momentum, charge, parity, etc. Some conservation laws are true for one fundamental force but not for the other.

6.
Conservation laws have a deep connection with symmetries of nature. Symmetries of space and time, and other types of symmetries play a central role in modern theories of fundamental forces in nature.