This post presents Gravitation class 11 notes in a nutshell. This one summarizes the key concepts, formulas, and applications. It also lists down a set of selected questions from the Gravitation chapter (prepared for ISC, CBSE class 11 physics, grade 12 physics, and UPSC preparation, IAS exams). Isaac Newton unified “earthly” bodies and “heavenly” bodies […]

## Numerical problems on Vertical motion

In this post we will solve harder numerical problems on Vertical motion physics. vertical motion is an interesting chapter in mechanics . Here you get selected problems to solve which will help you to test your understanding.

## Solution to problems – class 9 – Set 1 Q36

Problem Statement The mass of sun is 2 × 10^30 kg and the mass of earth is 6 × 10^24 kg. If the average distance between the sun and the earth be 1.5 × 10^8 km, calculate the force of gravitation between them. Solution M1 = mass of the sun = 2 × 1030 kgM2 […]

## Solution to problems – class 9 – Set 1 Q35

Problem Statement What is the force of gravity on a body of mass 150 kg lying on the surface of the earth ? (Mass of earth = 6 × 10^24 kg; Radius of earth = 6.4 × 10^6 m; G = 6.7 × 10–11 Nm2/kg^2) Solution M1 = mass of the body = 150 kgM2 […]

## Solution to problems – class 9 – Set 1 Q34

Problem Statement Calculate the force of gravitation between two objects of masses 50 kg and 120 kg respectively kept at a distance of 10 m from one another. (Gravitational constant, G = 6.7 × 10 -11 Nm2 /kg^2) Solution M1 = 50 kg M2 = 120 kg Distance = r = 10 m Force of […]

## 101 Solved Numerical Problems in Physics class 9 Motion for CBSE, ICSE, IGCSE, SSC

101 physics Numerical problems with solution – appropriate for high school (class / grade 9 , 10, 11, 12), IIT foundation, other exams including competitive examinations. An ever growing problem set.

## Physics problems – Solutions of selected numericals(set 1)

Physics Problem set with Solution Some of the posts in this blog include sample physics problem sets along with the post content. Readers can always try those. We have decided to publish the solutions to selected problems from different sets/posts, as we have done in this post. Physics Problem Q set source: (based on the […]

## Escape velocity Derivation & concept – derive formula √(2gR) for earth

We will first understand what escape velocity is and then we will focus on the escape velocity derivation to get its formula or equation. Now, what is escape velocity? Define Escape Velocity Escape velocity is defined as the minimum velocity with which if an object is thrown from the surface of the earth or any […]

## Orbital Velocity derivation & concepts for class 11 | How to derive the orbital velocity equation?

Orbital Velocity of a satellite is the minimum velocity it has to maintain to continue its circular motion in its orbit or in other words it is the minimum velocity of the object in circular motion that generates enough centripetal force to keep it in the circular orbit of given radius. We will discuss this in details as well as we will focus on the derivation of Orbital Velocity formula.

## Variation of g with height and depth – how g changes with height and depth

Variation of g with height and depth: Acceleration due to gravity or g varies as the height or depth varies with respect to the surface of the earth. This means the value of g on top of a mountain won’t be exactly the same as that on the earth’s surface. Similarly, g at a location […]

## A stone falls towards the earth but the opposite is not observed-why?

A stone falls towards the earth – why? A stone falls back on the ground. But the earth doesn’t seem to move towards it. Why? As said by this law of universal gravitation every object in this universe is attracting every other object towards it. This force of gravitational attraction between any two objects in […]

## Universal Law of Gravitation & Derivation of Gravitational Force formula

The objective of this post is the study of the Universal Law of Gravitation and the derivation of the Gravitational Force formula from the Universal Law of Gravitation. Universal Law Gravitation by Newton states about a force of attraction between any two objects. And as per this law, this force is (i) inversely proportional to […]

## Freefall in physics

In this post, we will find out (a) how to find the weight of a freely falling body (b) How the velocity of a freely falling body changes every second if we ignore air drag force (air resistance)? (c) Why do we feel weightless during freefall (d) Kinetic energy of a body under free fall (e) Applicability of Law of conservation of energy for free fall (e) how distance traveled per second varies