We all have an intuitive notion of force. In our experience, force is needed to push, carry or
throw objects, deform or break them. We also experience the impact of forces on us, like when
a moving object hits us or we are in a merry-ground.
In the macroscopic world, besides the gravitational force, we encounter several kinds
of forces: muscular force, contact forces between bodies, friction (which is also a contact force
parallel to the surfaces in contact)
At the present stage of our understanding,we know of four fundamental forces in nature,
which are described here :
- Gravitational Force
- Electromagnetic Force
- Strong Nuclear Force
- Weak Nuclear Force
- Towards Unification of Forces
Physicists explore the universe. Their investigations, based on scientific processes,
range from particles that are smaller than atoms in size to stars that are very far away. In
addition to finding the facts by observation and experimentation, physicists attempt to discover
the laws that summarize (often as mathematical equations) these facts.
No comments:
Post a Comment