General Scientific Laws - 15 Mints Seminar Notes
General Scientific Laws - 15 Mints Seminar Notes
1. Archimede's principle
It states that a body when wholly or partially immersed in a liquid, experiences an upward thrust which is equal to the weight of the liquid displaced by it. Thus, the body appears to lose a part of its weight. This loss in weight is equal to the weight of the liquid displaced by the body.
2. Newton's First Law of Motion [Law of Inertia / Law of Galileo] -
Every object continues to be in its state of rest or of uniform motion in a straight line unless acted upon by an external force.
3. Newton's Second Law of Motion
The Force applied on a body is equal to the product of the mass of the of the body (m) and the acceleration (a) produced by the body.
F = ma
4. Newton's Third Law of Motion
For every action there is an equal and opposite reaction. Examples: Swimming, Bullet, Rocket, etc
5. Newton's Law of Universal Gravitation
Any two bodies in the universe attracts each other body with a force 'F' that is directly proportional to the product of their masses (m1 x m2) and inversely proportional to the square of the distance (d) between them.
F = G (m1 x m2) / d2
6. Law of conservation of Energy.
The total energy in an isolated system remains constant. The energy can neither be created nor be destroyed but it can be transformed from one form to another form.
7. Pascal's Law
The pressure applied anywhere in a confined incompressible fluid is transmitted equally in directions throughout the fluid.
8. Law of Reflection of Light
(1) The angle of incidence is equal to the angle of incidence
(2) The incident ray, the reflected ray and the normal at the point of incidence all lie on the same plane.
9. Aufbau principle
It states that in an unexcited atom, electrons reside in the lowest energy orbitals available to them.
10. Avogadro's Law
It states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules.
11.Brownian motion
It is a zigzag, irregular motion exhibited by small solid particles when suspended in a liquid or gas due to irregular bombardment by the liquid or gas molecules.
12. Bernoulli's principle
It states that as the speed of a moving fluid, liquid or gas, increases, the pressure within the liquid decreases. The aerodynamic lift on the wing of an aeroplane is also explained in part by this principle.
13. Boyles's Law
It states that temperature remaining constant, volume of a given mass of a gas varies inversely with the pressure of the gas.
Thus, PV = K (constant),
where, P = Pressure and
V= Volume.
14. Charles's Law
It states that pressure remaining constant, the volume of a given mass of gas increases or decreases by 1/273 part of its volume at 0 degree Celsius for each degree Celsius rise or fall of its temperature.
15. Coulomb's Law
It states that force of attraction or repulsion between two charges is proportional to the amount of charge on both charges and inversely proportional to the square of the distance between them.
16. Heisenberg principle (uncertainty principle)
It is impossible to determine with accuracy both the position and the momentum of a particle such as electron simultaneously.
17. Gay-Lussac’s Law of combining volumes
Gases react together in volumes which bear simple whole number ratios to one another and also to the volumes of the products, if gaseous — all the volumes being measured under similar conditions of temperature and pressure.
18. Graham’s Law of Diffusion -
It states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure.
19. Kepler's Law
(1) Each planet revolves round the Sun in an elliptical orbit with the Sun at one focus.
(2) The straight line joining the Sun and the planet sweeps out equal areas in equal intervals.
(3) The squares of the orbital periods of planets are proportional to the cubes of their mean distance from the Sun.
20. Ohm's Law
It states that the current passing through a conductor between two points is directly proportional to the potential difference across the two points provided the physical state and temperature etc. of the conductor does not change.
21. Pauli exclusion principle -
It explains that no two electrons in the same atom or molecule can have the same set of quantum numbers.
22. Raman effect
It is the change in wavelength that occurs when light is scattered by the atoms or molecules in a transparent medium.
23. Tyndall effect
The scattering of light by very small particles suspended in a gas or liquid.
24 Law of Floatation
For a body to float, the following conditions must be fulfilled:
(1) The weight of the body should be equal to the weight of the water displaced.
(2) The centre of gravity of the body and that of the liquid displaced should be in the same straight line.
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