ESS
Grade-6
Easy
Question
Which of the following statement is correct?
- The planets revolve in orbit due to inertia.
- The movement of planets is in a straight line due to gravity.
- Venus is an outer planet.
- Mars has no moons.
Hint:
All the planets show same motion around the sun.
The correct answer is: The planets revolve in orbit due to inertia.
The correct option is a)The planets revolve in orbit due to inertia.
- The gravitational forces of the sun and planets work together with inertia to create orbits and keep them constant.
- Gravity pulls the sun and planets apart. Inertia provides the tendency to maintain velocity and keep moving. Planets want to move in straight lines due to the physics of inertia.
- But gravity wants to change its motion to pull the planets towards the core of the sun.
- This gives a rounded trajectory as a compromise between the two forces.
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