The universe has a lot of forces, a lot of pushes and pulls. We're always pushing or pulling something, even if only the ground. But it turns out that in physics, there are really only four fundamental forces from which everything else is derived: the strong force, the weak force, the electromagnetic force, and the gravitational force. The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe! This is called Newton's Universal Law of Gravitation. i. A body of mass 1kg on the surface of earth is attracted by the earth with a force which is equal to a. 9.8N b. 6.67x 1011 c. 1 N d. 9.8m/s ii. What is the gravitational force between two objects? a. attractive at large distances only b. attractive at small distances only c. attractive at all distances d. attractive at large distances but repulsive at small distances iii. The value of ‘g’ a. Increases as we go above the earth’s surface b. Decreases as we go to the centre of the earth c. Remains constant d. Is more at equator and less at poles iv. The ball is thrown up, the value of ‘g’ will be a. Zero b. positive c. negative d. negligible v. The gravitational force causes a. Tides b. Motion of moon c. None of them d. Both a and b -------------------------------------------------------------------------------------------------------------------------- More questions to be added shortly...