PHYSICS 26
#1

Theory of Relativity
*Theory of relativity (1905) was introduced by 
Ans : Albert Einstein 
*Theory of relativity have two separate theories
(i)Special theory of relativity
(a)Speed of light is constant for all observers
(b)Observer moving at constant speeds should be subject to the same physical laws.
(ii)General theory of Relativity (1915)
*The translational motion along the curved path - Curvilinear motion
eg:- The motion of a rocket in space.
*The motion which repeats after regular intervals of time - Periodic motion 
eg:- The rotation of the earth around the sun.

Rotation and Revolution
* If the axis of the rotating body is within the body, its motion is said to be Spin motion or Rotational motion.
eg: The earth spins on its own axis in 24 hrs.This will make a  day.
*When an object travels around another object it is known as Revolution eg: Earth revolves around the sun in 365 days.This will make an year.

Projectile Motion
*The motion of an object in a vertical plane under the influence of gravitational force is known as projectile motion. 
eg: Rocket fired into space, a golf ball in flight etc.
*The projectile path is known as trajectory.
*The path of the projectile is always a parabola.
*A projectile reaches its maximum range, when the angle of projection is at 45°.

Inertia
*The tendency of a body to continue its state of rest or uniform motion along a straight line is called 
Ans : Inertia
*Law of inertia was discovered by 
Ans : Galileo
*There are 3 types of Inertia 
Ans :  Inertia of Rest, Inertia of Motion, 

Inertia of Direction.
*As the bus starts moving, a man sitting inside leans backwards because of inertia of rest.
*When a train stops suddenly, passengers in the running train feel an instant bend in the forward direction because of inertia of motion.
*An athlete runs some distance before taking a long jump, by running the athlete gives himself larger inertia of motion.
*The rotating wheels of an automobile throw out mud tangentially outward because of inertia of direction.
*Force required to stop a moving body depends on its mass and velocity.

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