1. PRESENTD BY : MISS PRITI SINGHAL

2.  Gravity is a force between all objects.  Gravity  Gravity is a force between all objects.  Gravity

3. GRAVITY DEFINED  Gravity is the tendency of objects with mass to accelerate towards each other.  Gravity is one of the four fundamental forces in nature.  Gravity is the tendency of objects with mass to accelerate towards each other.  Gravity is one of the four fundamental forces in nature.

5. Sir Isaac Newton wrote the Law of Gravitation in 1687(after 45 years of Kepler)

6.  The size of the force also depends on the distance between the objects.  The size of the force depends on the mass of the objects.  The size of the force also depends on the distance between the objects.  The size of the force depends on the mass of the objects.

7. The force of gravity on something is called is weight,Because it is a force it is measured in Newtons.

8.  Mass is a measure of the amount of material an object is made of.It is measured in Kilograms.  Weight is the force of gravity of an object. It is measured in NEWTONs.  Mass is a measure of the amount of material an object is made of.It is measured in Kilograms.  Weight is the force of gravity of an object. It is measured in NEWTONs.

9.  Mass is a physical property of matter that explains how much matter is in an object.  Mass does not change when gravity changes  Mass is a physical property of matter that explains how much matter is in an object.  Mass does not change when gravity changes  Weight is a force which is calculated by multiplying the acceleration of gravity times mass.  Weight can change when gravity changes.  Weight is a force which is calculated by multiplying the acceleration of gravity times mass.  Weight can change when gravity changes.

10.  GRAVITATION FORCE IS THE ATTRACTION FORCE BETWEEN TWO OR MORE OBJECTS.  IT IS PROPORTIONAL TO THE PRODUCT OF MASS OF THE OBJECTS.  IT IS INVERSLY PROPORTIONAL TO THE SQURE OF THE DISTANCE BETWEEN THE OBJECTS.  THE FORCE ACTS IN THE DIRECTION OF THE LINE CONNECTING THE CENTRES OF THE MASSES  GRAVITATION FORCE IS THE ATTRACTION FORCE BETWEEN TWO OR MORE OBJECTS.  IT IS PROPORTIONAL TO THE PRODUCT OF MASS OF THE OBJECTS.  IT IS INVERSLY PROPORTIONAL TO THE SQURE OF THE DISTANCE BETWEEN THE OBJECTS.  THE FORCE ACTS IN THE DIRECTION OF THE LINE CONNECTING THE CENTRES OF THE MASSES

11. F1 F2 r F1=F2= Gm 1 m 2\ r 2 We represent the Gravitational force by the symbol of F and its unit is NEWTON. F1 F2 r F1=F2= Gm 1 m 2\ r 2 We represent the Gravitational force by the symbol of F and its unit is NEWTON. M1 M2

12.  G is a constant which value remains constant at any place,so that’s why it called the UNIVERSAL GRAVITATIONAL CONSTANT and the value of G is : G = 6.67x10 -11 N m 2 /kg 2 Universal Gravitational is also known as an Inverse Square.  G is a constant which value remains constant at any place,so that’s why it called the UNIVERSAL GRAVITATIONAL CONSTANT and the value of G is : G = 6.67x10 -11 N m 2 /kg 2 Universal Gravitational is also known as an Inverse Square.

13. Ques. Find the value of Gravitational Force,when the masses of the two objects are 2 kg and 6 kg, and the distance between them is 4 m.(G= 6.67x10 -11 N m 2 /kg 2)  F = Gm 1 m 2\ r 2 F = 6.67x10 -11 x 2 kg x 6 kg 4 x 4 =5.0025x10 -11 N

14.  PRITI SINGHAL  COMPUTER INSTRUCTOR  UPS KAILASPUR  SAHARANPUR  PRITI SINGHAL  COMPUTER INSTRUCTOR  UPS KAILASPUR  SAHARANPUR