Every object in the universe attracts every other object. They attracts with a force which is directly proportional to the product of their masses and inversly proportional to the square of the distance between them.

Gravitational Force, F∝(m1m2)/R2
F=(G×m1m2)/R2, where G= gravitational constant, the value of G = 6.67 × 10-11 Nm2/kg2

Falling Objects

Earlier it is thought that the lighter objects fall slowly and the heavier objects fall more rapidly. Later Galileo found that this thought was wrong. Galileo dropped two stones of different masses from the top of the leaning rower of pisa, and found that they hit the ground at the same time. From this Galileo concluded that the acceleration of an object falling freely towards the earth does not depend on the mass of object it only depends on the surface area, so the feather of a bird have larger area then the stone of same weight, so it faces more resistance of air and its speed gets slow down. In vacuum, all teh objects fall at the same rate.

Acceleration due to Gravity

The uniform acceleration produced in afreely falling body due to the gravitational pull of the earth is known as acceleration due to gravity and is denoted by the letter 'g'. The value of 'g' is taken as 9.8 m/s2.
The value of acceleration due to gravity 'g' is maximum on the surface of earth. It decreases as we go above or inside the surface of earth. 'g' is minimum at equator and maximum at poles.


The mass of a body is the quantity of matter contained in it. The unit of mass is kilogram. The mass of a body is constandt and remains same everywhere in universe.

Center of Mass

The centre of mass of a body is that point where the whole mass of the body can be thought to be concentrated.


The earth attracts every body towards its centre with a certain force. The weight of a body is the force with which it is attracted towards the centre of the earth.
The weight of body is given by W= m ×g. Weight is a vector quantity. The gravitational pull of the moon is about one-sixth of that of the earth, therefore, the weight of an object on moon will be about one-sixth of what it is on the earth.


The weight of a body is the force with which the earth attracts it. An object is said to be weightless when it is galling freely under the action of gravity.


A falling object having a horizontal velocity is called a projectile and it moves in curved path. When we through a stone horizontally, it have two type of motions i.e. horizontal and vertical(towards earth). This type of motion is known as projectile motion.

Escape velocity

The volicty at which we through an object, that object doesnot return to earth and escape itself in space is known as escape velocity. The escape velocty of earth is 11.16 km/sec.

Latest Current Affaris

Current affairs 05/06/2019
Current affairs 05/06/2019

1). Comptroller and auditor general Rajiv Mehrishi has been appointed as the external auditors of World Health Organisation (WHO) for a four year term from 2020-23. 2).World Environment Day is observed on 5 June(Theme: The Air Pollution). 3). Madhya Pradesh cabinet has passed a resolution to increase reservation of OBC's 27%.

करंट अफेयर्स 03-04/06/2019
करंट अफेयर्स 03-04/06/2019

1. नयब बुकेले को ईआई सल्वाडोर के राष्ट्रपति के रूप में चुना गया है। (ईआई सल्वाडोर की राजधानी: सैन सल्वाडोर, मुद्रा: संयुक्त राज्य अमेरिका डॉलर) 2. राष्ट्रीय सुरक्षा सलाहकार (NSA) अजीत डोभाल की दोबारा अपने पद पर नियुक्ति हुई। NDA सरकार के दूसरे कार्यकाल में उन्हें कैबिनेट रैंक दिया गया है। 3. 3 जून को विश्व साइकिल दिवस मनाया जाता है।

Current affairs 03-04/06/2019
Current affairs 03-04/06/2019

1. Nyaib Bukele has been Sworn in as the president of  EI Salvador ( EI Salvador's capital: San Salvador, currency: United States Dollar). 2. National Security Advisor (NSA) Ajit Doval reappointed to his post and given Cabinet rank in the second term of the NDA government. 3. World Bicycle Day is observed on 3rd June .

Current Affairs Quiz

डेली जीके क्विज 17/05/2019
डेली जीके क्विज 17/05/2019

1. भारतीय नौसेना प्रमुख का नाम बताएं? 2. हाल ही में ICC द्वारा पहली महिला मैच रेफरी के रूप में किसे नियुक्त किया गया है? 3. हाल ही में एक हल्के खेल विमान (एलएसए) में अटलांटिक महासागर को पार करने वाली दुनिया की पहली महिला कौन बनी है?

Daily Gk Quiz 17/05/2019
Daily Gk Quiz 17/05/2019

1. Name the Indian Navy Chief? 2. Recently who has been appointed as first female match referee by ICC? 3. Recently who has becomes the world’s first woman to cross the Atlantic Ocean solo in a light sports aircraft (LSA)?

डेली जीके क्विज 29/09/2018
डेली जीके क्विज 29/09/2018

प्रश्न 1)। हाल ही में एशियाई विकास बैंक (एडीबी) ने राज्य में रोजगार को बढ़ावा देने के लिए मध्य प्रदेश में पहला बहु-कौशल पार्क स्थापित करने के लिए 150 मिलियन डॉलर के ऋण को मंजूरी दे दी है। एडीबी के अध्यक्ष कौन हैं? प्रश्न 2)। परकर्म परव किस अवसर पर मनाया जा रहा है? प्रश्न 3)। भारत की लाइव स्टॉक जनगणना 1 अक्टूबर से शुरू होने वाली है। इस तरह की कितनी जनगणना पहले आयोजित की गई है और यह कौन सी जनगणना है?