Newton’s universal law of gravitation

1. Newton’s Law of Universal Gravitation Presented by Vineetha I V Physical Science Roll No : 20

2. The idea of gravity was Introduced by Sir Isaac Newton in the late 1600’s He was a scientist who combine ideas to explain how the universe operates

3. How He Discovered it…? Newton’s law of Gravitation was discovered while he watched an apple fall from a tree. The force that pulled the apple to the ground was the same with which apple attracted earth.

4. All Matter Is Affected by Gravity Because of gravity you are being pulled toward your book, your pencil, and every other object around you. You exert an attractive force on everything around you and everything is exerting an attractive force on you. This attractive force is called gravity. All objects experience an attraction toward all other objects in this universe.

5. Gravitational Force Gravitation force depends on two things: The mass of the two objects The distance between the two objects

6. Gravitational Force and Mass Earth attracts an elephant more than a cat. Earth attracts coconut more than an apple. Earth’s gravitational force is greater than that of moon. Gravitational force increases as mass increases .

7. Gravitational force is directly proportional to the product of masses.

8. Gravitational Force and Distance Gravity between you and the earth is greater than the gravity between you and the sun. Gravitational force decreases as distance increases.

9. Gravitational force is inversely proportional to the square of distance between the masses

10. All objects in the universe attract each other through gravitational force. Every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. F ∝ M 1 M 2 d 2 F = G M 1 M 2 d 2 G = Gravitational Constant & G = 6.67x10 -11 Nm 2 /kg 2 This is Law of Universal Gravitation Universal : applies to all objects!!! The force acts in the direction of the line connecting the centers of the masses.

11. Thank You…