SOLAR SYSTEM

Detailed explanation-1: -Gravity is the force that keeps planets in orbit around the Sun. Gravity alone holds us to Earth’s surface.

Detailed explanation-2: -Newton concluded that two factors-inertia and gravity– combine to keep Earth in orbit around the sun, and the moon in orbit around Earth.

Detailed explanation-3: -Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth.

Detailed explanation-4: -Inertia keeps a planet moving in a forward direction. When the force of gravity balances a planet’s inertia the result is circular motion. A planet needs to be moving at just the right speed to stay in orbital motion around the sun. If a planet is moving too fast, it can escape the solar system.

Detailed explanation-5: -In the absence of gravity, the planet would obey the law of inertia (Newton’s first law) and fly off in a straight line in the direction of the velocity at constant speed. The force of gravity serves to overcome the inertial tendency of the planet, thereby keeping it in orbit.

Detailed explanation-6: -Like all objects with mass, planets have a tendency to resist changes to their direction and speed of movement. This tendency to resist change is called inertia, and its interaction with the gravitational attraction of the sun is what keeps the planets of the solar system, including Earth, in stable orbits.

Detailed explanation-7: -Things in space have inertia. That is, they travel in a straight line unless there is a force that makes them stop or change. The movement of things in space is influenced by gravity.