In this Science (Physics) video in Hindi for Class 9 we explained why planets move faster when closer to sun. This is a topic from Chapter 10 - 'Gravitation' for class 9th.
Planets move in elliptical path around the sun. As the path is elliptical, there is a point where the planet is farthest from the sun which is called 'aphelion'. And there is a point where the planet is closest to the sun which is called 'perihelion'. According to Kepler's second law of planetary motion the line joining the planet and the Sun sweep equal areas in equal intervals of time. It concludes, when the planet crosses the aphelion, it moves slowest and when crosses the perihelion, it moves fastest.
The reason behind this, is the difference in potential energy, which has been explained in this video.
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🔴 Click here to watch the whole playlist on Chapter 10 : 'Gravitation' for Class 9 :
• Introduction to Gravit...
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Other videos from this chapter :-
🔴 Introduction to Gravitation
• Introduction to Gravit...
🔴 Universal Law of Gravitation
• Universal Law of Gravi...
🔴 Free Fall || Calculating 'g'
• Free Fall || Calculate...
🔴 Motion Under Gravity
• Motion Under Gravity |...
🔴 Motion Under Gravity (Part 2)
• Motion Under Gravity (...
🔴 Mass and Weight
• Mass and Weight || for...
🔴 Weight of an object on the moon
• Weight on Moon || for ...
🔴 Kepler's Laws of Planetary Motion
• Kepler's Laws of Plane...
🔴 How did Newton guess the Inverse Square Rule
• How did Newton guess t...
🔴 Thrust and Pressure
• Thrust and Pressure ||...
🔴 Pressure in Fluids
• Pressure in Fluids || ...
🔴 Pressure in Fluids (Part 2) - Pascal's law, Torricelli's law
• Pressure in Fluids (Pa...
🔴 Buoyancy
• Buoyancy || for Class ...
🔴 Archimedes' Principle
• Archimedes' Principle ...
🔴 Why objects float or sink when placed on the surface of water
• Why objects float or s...
🔴 Relative Density
• Relative Density || fo...
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