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Line 111: − − = Significance of the gravitational force = − − == Discovery of planets == − − Accurate measurements on the orbits of the plantes indicated that they did not precisely follow Kepler's laws. Slight deviations from perfectly elliptical orbits were observed. Newton was aware that this was to be expected from the Law of Universal Gravitation. The derivation of perfectly elliptical ignores the forces due to the other planets. These deviations called perturbations are observed and led to the discovery of Neptune and Pluto. Planets around distant stars were also inferred from the regular wobble of each star due to the gravitational attraction of the revolving plant. − − == Ocean tides == − − Ocean tides are caused by differences in the gravitational pull between the Moon and the Earth on the opposite sides of the Earth. Gravitational force is stronger on the side of the Earth nearer to the Moon and is weaker on the side of the Earth farther from the Moon. The bulge that is caused in the Earth's oceans due to this gravitational pull results in two sets of tides on the Earth. − === Activity 3 : Thought Experiment === − − '''Objective: To understand the nature of gravitational force''' − − '''Procedure:''' − − Ask the children to think about what will happen if we had a hollow tunnel running through the centre of the Earth and we dropped a ball into it. What will happen to the ball?<br><br>
Significance of Gravitational Force (view source)
Revision as of 10:15, 4 December 2013
, 10:15, 4 December 2013→Significance of the gravitational force
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= Projectile and Satellite Motion =
= Projectile and Satellite Motion =