Basic Physics
- 5. Physics is the science of matter and its motion— the science that deals with concepts such as force, energy, mass, and charge.
- 9. 1. CLASSICAL MECHANICS (THE LAWS OF MOTION) Newton laid out and explained the three fundamental laws of classical mechanics: Objects at rest will remain at rest, and objects in motion will remain in motion at the same velocity, unless the object is acted on by an external force. Force equals mass times acceleration (F=ma) When one object exerts a force on another object, the second object exerts an equal and opposite force on the first.
- 10. 2. ELECTROMAGNETISM Electromagnetism is defined as an attraction between particles which is defined as created by electricity. An example of electromagnetism is the force which is the basic operation of an electric motor. Electromagnets are used in all kinds of electric devices, including hard disk drives, speakers, motors, and generators, as well as in scrap yards to pick up heavy scrap metal. They're even used in MRI machines, which utilize magnets to take photos of your insides!
- 11. 3. RELATIVITY Everything is moving relative to everything else, hence Einstein's theory of relativity. It is known as special relativity because it applies only to special cases: frames of reference in constant, unchanging motion Relativity comes in two forms, Special and General. ... Special Relativity is the theory that no matter what constant speed you're travelling all the laws of physics are the same. General Relativity says that being at rest in a gravitational field and accelerating are physically identical.
- 12. 4. THERMODYNAMICS Thermodynamics, science of the relationship between heat, work, temperature, and energy. In broad terms, thermodynamics deals with the transfer of energy from one place to another and from one form to another. The key concept is that heat is a form of energy corresponding to a definite amount of mechanical work.
- 13. IMPORTANCE OF PHYSICS IN OUR DAILY LIFE
- 14. Pulleys are used to lift heavy loads. Electricity is used to get light, heat and mechanical energy that drives fans and electric motors. Means of transportation such as cars and airplanes, domestic appliances such as air conditioners, refrigerators, vacuum cleaners, washing machines, and microwave oven, etc. The means of communication such as radio, TV, telephone, and computer are the result of applications of physics. These devices have made our lives much easier and faster and more comfortable than in the past. The computer is the invention of physics.