Questions on General Science are commonly asked in different SSC, Railway & other government exams. In order to ace any competitive exam, one needs to score good marks in general science. Get complete General science notes in this blog.

General Science Notes- At a Glance

Force:
Force is anything that causes a change in the position of a static object or change in the velocity of a dynamic object. The unit of force is Newton. For studying force and its effect on bodies, we can make use of Newton’s laws of motion.

Newton’s Laws of Motion:

Newton’s 1st Law of Motion: It states an object continues its uniform motion or stays at its original position unless it is acted by a force. This theory also gives us the concept of Inertia.
Newton’s 2nd Law of Motion: It states applied force is directly proportional to the mass of the object and its acceleration. This law gives us the famous equation, F=ma
Newton’s 3rd Law of Motion: States that for every action there will be an equal and opposite reaction. The application of this theory is seen during rowing a boat.

Circular Motion:

In circulation motion, two forces come into play, Centripetal, and Centrifugal
forces. As shown in the image, a centripetal force acts towards the center and
a centrifugal force acts away from the center. Normally during a circular motion,
both the forces are equal in magnitude and act in opposite directions, hence
cancels each other. When the person releases the object during the circular
motion, it moves in the path of inertia with a force equals to centrifugal force.

Kepler’s Laws of Planetary Motion:

1. Law of orbits: All planets revolve around the sun in elliptical orbits, with the sun situated at one of the foci.
2. Law of areas: A line that joins a planet to the sun, sweeps equal areas in equal intervals of time.
3. Law of Periods: Square of the time period of revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet.

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